At least 24 hours before the day of arrival. Otherwise, the hotel will charge the amount corresponding to the 1st night on the credit card. Unique dates with various cancellation policies: 3GSM - 12-16 Feb 06 inclusive: ten days prior to arrival. Alimentaria - 06-11 Mar 06 inclusive: 15 days prior to arrival. F1 - 12-14 May 06 inclusive: 15 days prior to arrival. Congress CANCER - 28 Jun - 01 Jul 06 incusive: 15 days prior to arrival. Cardiology- 02-06 Sep 06 inclusive: 15 days prior to arrival. Recent Year Offers: five days, 100% charge The hotel reserves the right to pre-authorise credit cards prior to arrival.