Data trends on cheapest hotel rates as well as median rate for three months of three, four and five star hotels across some of the major cities in Europe.
This set covers March to May 2012, taken in the month of February 2012 (all rates are in US dollars for two adults for a one-night stay).
Three star [click for larger image]:

| City |
Check In Month |
Minimum Rate |
Median Rate |
Cheapest Hotel in the City |
| AMSTERDAM |
March |
37.68 |
178.40 |
HEM HOTEL AMSTERDAM |
| |
April |
69.97 |
191.32 |
HEM HOTEL AMSTERDAM |
| |
May |
79.40 |
193.09 |
HEM HOTEL AMSTERDAM |
| BARCELONA |
April |
68.35 |
167.54 |
AGORA STUDENT RESIDENCE HOTEL |
| |
May |
62.55 |
174.48 |
APARTHOTEL VALLES |
| DUBLIN |
March |
40.37 |
100.92 |
RUBELL COURT HOTEL DUBLIN |
| |
April |
27.22 |
105.61 |
TEMPLE BAR |
| |
May |
54.50 |
118.77 |
BEST WESTERN SHELDON PARK |
| EDINBURGH |
March |
48.29 |
127.09 |
THE POINT HOTEL |
| |
April |
50.84 |
142.20 |
EDINBURGH HOUSE HOTEL |
| |
May |
76.27 |
182.72 |
PIRIES HOTEL |
| HELSINKI |
March |
43.06 |
138.68 |
AVA |
| |
April |
43.06 |
132.54 |
AVA |
| |
May |
49.11 |
117.06 |
AVA |
| LONDON |
March |
39.05 |
148.88 |
RUSS HILL HOTEL |
| |
May |
49.25 |
178.35 |
CROYDON COURT HOTEL |
| MADRID |
March |
36.33 |
126.04 |
HOTEL ARAVACA GARDEN |
| |
April |
37.68 |
146.53 |
BEST WESTERN HOTEL FLORIDA |
| |
May |
37.68 |
138.10 |
BEST WESTERN HOTEL FLORIDA |
| PARIS |
March |
32.16 |
188.69 |
A LA VILLA MADAME |
| |
April |
34.98 |
191.35 |
ADAGIO CITY APARTHOTEL PARIS BERCY |
| |
May |
69.97 |
197.89 |
MURAT HOTEL |
| PRAGUE |
March |
21.53 |
57.86 |
SLAVIA HOTEL PRAGUE |
| |
April |
21.53 |
111.98 |
SLAVIA HOTEL PRAGUE |
| |
May |
39.02 |
96.88 |
EUROHOTEL PRAHA |
| ROME |
March |
28.26 |
119.83 |
PETRA & RESIDENCE HOTEL ROME |
| |
April |
41.26 |
181.81 |
OPERA STREET IN VATICAN |
| |
May |
52.04 |
181.65 |
CAMPING VILLAGE ROMA |
| VENICE |
March |
36.33 |
107.76 |
CLUB HOTEL VENICE |
| |
April |
41.94 |
282.12 |
ALLA GIUSTIZIA HOTEL VENICE |
| |
May |
56.55 |
234.26 |
VILLA PATRIARCA |
| ZURICH |
March |
87.06 |
253.19 |
X-TRA HOTEL |
| |
April |
87.06 |
238.35 |
X-TRA HOTEL |
| |
May |
87.06 |
255.61 |
X-TRA HOTEL |
Four star [click for larger image]:

| City |
Check In Month |
Minimum Rate |
Median Rate |
Cheapest Hotel in the City |
| AMSTERDAM |
March |
58.44 |
230.00 |
WESTCORD FASHION HOTEL AMSTERDAM |
| |
April |
35.64 |
262.39 |
INNTEL HOTEL AMSTERDAM ZAANDAM |
| |
May |
79.39 |
281.16 |
BEST WESTERN AMSTERDAM AIRPORT |
| BARCELONA |
March |
58.48 |
175.03 |
BALMORAL (COSTA DEL SOL) |
| |
April |
63.73 |
201.84 |
RAFAEL BADALONA HOTEL |
| |
May |
63.73 |
222.10 |
RAFAEL BADALONA HOTEL |
| DUBLIN |
March |
47.77 |
132.54 |
HILTON DUBLIN AIRPORT |
| |
April |
57.19 |
133.76 |
CLARION HOTEL DUBLIN LIFFEY VALLEY |
| |
May |
47.77 |
139.15 |
HILTON DUBLIN AIRPORT |
| EDINBURGH |
March |
62.76 |
158.55 |
HOLIDAYINN EDINBURGH CITY WEST |
| |
April |
30.78 |
165.24 |
MARRIOTT DALMAHOY HOTEL |
| |
May |
64.35 |
206.57 |
APEX EUROPEAN |
| HELSINKI |
March |
64.59 |
171.47 |
CUMULUS HAKANIEMI |
| |
April |
72.66 |
169.54 |
PARK KAPYLA |
| |
May |
74.68 |
220.67 |
PARK KAPYLA |
| LONDON |
March |
27.01 |
271.88 |
PICCADILLY HOTEL |
| |
April |
27.01 |
284.09 |
PICCADILLY HOTEL |
| |
May |
28.60 |
283.24 |
PICCADILLY HOTEL |
| MADRID |
March |
51.13 |
144.59 |
CROWNE PLAZA MADRID AIRPORT HOTEL |
| |
April |
51.13 |
157.45 |
CROWNE PLAZA MADRID AIRPORT HOTEL |
| |
May |
54.83 |
158.78 |
CROWNE PLAZA MADRID AIRPORT HOTEL |
| PARIS |
March |
69.97 |
316.21 |
MERCURE PARIS GARE DE LYON |
| |
April |
48.50 |
319.57 |
HOTEL LE MERIDIEN MONTPARNASSE |
| |
May |
77.37 |
338.41 |
APTS CITEA SAINT DENIS PLEYEL |
| PRAGUE |
March |
25.57 |
97.33 |
STEP HOTEL PRAGUE |
| |
April |
37.66 |
164.16 |
K+K FENIX HOTEL PRAGUE |
| |
May |
39.64 |
151.38 |
WELLNESS HOTEL STEP |
| ROME |
April |
40.37 |
234.13 |
PAPILLO HOTELS & RESORTS ROMA |
| |
May |
55.84 |
242.33 |
SELENE SPORTING |
| VENICE |
March |
43.06 |
184.34 |
LOCANDA NOVO HOTEL VENICE |
| |
April |
51.13 |
396.25 |
APOGIA SIRIO |
| |
May |
78.04 |
385.73 |
APOGIA SIRIO |
| ZURICH |
March |
90.41 |
317.00 |
AIRPORT BEST WESTERN |
| |
April |
70.73 |
299.22 |
ENGIMATT HOTEL |
| |
May |
105.63 |
303.56 |
AIRPORT BEST WESTERN |
Five star [click for larger image]:

| City |
Check In Month |
Minimum Rate |
Median Rate |
Cheapest Hotel in the City |
| AMSTERDAM |
March |
85.11 |
395.60 |
BILDERBERG GARDEN HOTEL - MANGERIE DE KERSENTUIN AMSTERDAM |
| |
April |
111.20 |
466.24 |
PULITZER |
| |
May |
170.77 |
486.42 |
RADISSON SAS HOTEL AMSTERDAM AIRPORT |
| BARCELONA |
April |
130.52 |
450.86 |
REY JUAN CARLOS I |
| |
May |
134.56 |
479.64 |
REY JUAN CARLOS I |
| DUBLIN |
March |
83.96 |
267.29 |
THE LOMBARD TOWNHOUSE |
| |
April |
36.64 |
270.71 |
THE WESTIN |
| |
May |
163.49 |
292.50 |
THE CONRAD INTERNATIONAL |
| EDINBURGH |
March |
99.30 |
290.76 |
THE CHESTER RESIDENCE |
| |
April |
64.60 |
300.30 |
BALMORAL HOTEL EDINBURGH |
| |
May |
158.89 |
326.75 |
CALEDONIAN HILTON EDINBURGH |
| HELSINKI |
March |
112.36 |
278.09 |
HILTON HELSINKI VANTAA AIRPORT HOTEL |
| |
April |
112.36 |
285.26 |
HILTON HELSINKI VANTAA AIRPORT HOTEL |
| |
May |
135.90 |
307.46 |
HILTON HELSINKI VANTAA AIRPORT HOTEL |
| LONDON |
March |
141.41 |
507.50 |
CAPITAL HOTEL |
| |
April |
75.88 |
507.25 |
HOTEL HYATT REGENCY CHURCHILL |
| |
May |
149.75 |
530.68 |
MARRIOTT WEST INDIA QUAY |
| MADRID |
March |
102.26 |
283.27 |
OCCIDENTAL MIGUEL ANGEL HOTEL & URBAN SPA MADRID |
| |
April |
99.57 |
281.22 |
HILTON MADRID AIRPORT |
| |
May |
99.57 |
281.30 |
HILTON MADRID AIRPORT |
| PARIS |
March |
126.48 |
757.56 |
HYATT REGENCY PARIS-CHARLES DE GAULLE HOTEL |
| |
April |
110.46 |
641.73 |
SCRIBE HOTEL PARIS |
| |
May |
138.59 |
727.40 |
HYATT REGENCY PARIS-CHARLES DE GAULLE HOTEL |
| PRAGUE |
March |
65.76 |
202.96 |
CORINTHIA TOWERS |
| |
April |
67.53 |
290.72 |
CORINTHIA TOWERS |
| |
May |
102.86 |
298.28 |
CORINTHIA TOWERS |
| ROME |
March |
127.83 |
454.35 |
HOTEL LA GRIFFE |
| |
April |
71.64 |
520.74 |
HOTEL LA GRIFFE |
| |
May |
169.99 |
604.53 |
PARCO DEI PRINCIPI |
| VENICE |
March |
82.08 |
414.68 |
SAN CLEMENTE PALACE VENICE |
| |
April |
111.68 |
660.96 |
HILTON MOLINO STUCKY VENICE |
| |
May |
184.79 |
662.52 |
SAN CLEMENTE PALACE VENICE |
| ZURICH |
March |
130.59 |
658.55 |
MOVENPICK ZURICH-AIRPORT |
| |
April |
131.71 |
621.61 |
MOVENPICK ZURICH-AIRPORT |
| |
May |
143.98 |
842.73 |
MOVENPICK ZURICH-AIRPORT |
NB: RateGain specializes in competitive price intelligence and rate shopping solutions for hotels, online travel companies and airlines. It currently tracks more than one billion hotel rates every month across countries in US, Europe, Middle East, Asia and Latin America.
NB2: The above data is indicative in nature and RateGain cant be held liable for its accuracy or usefulness for any purpose.