IS AN AMOUNT CHARGED ON THE CREDIT CARD?
Usually not, credit card details are only required to guarantee your reservation and will eventually be charged a penalty in case of late cancellation or no-show.
In case of non-refundable reservations is instead charged the full amount of the stay.
In exceptional cases (holidays, events in the area, periods of maximum occupancy, etc..) may be required a deposit, but it is always specified.
(From Tuesday, August 27, 2013, never expire)