We reserved a place seven months ahead of time and our credit card were charged for half of the total cost. Five months before the original arrival date, we found that we no longer needed the accommodations due to an unexpected medical event, and proceeded to cancel.
To our dismay, we were charged with a service fee of $130. This seems to be exorbitant as there did not seem to be any significant service provided. It was indicated there would be a full refund if you cancelled and we assumed there would be a full refund for such an early cancellation (they will have no trouble whatsoever in getting a new renter).
Needless to say, we are unhappy with Airbnb and will think twice before using them again. The service fees are outrageous.