A cancellation is measured on a notice scale rather than a flat forfeit: nothing is kept beyond twenty-four hours, half inside them, all once she is travelling.
Cancelling never leaves you owing the house damages. What the house may keep is the share of the fee it has already earned at the moment your message lands, and the notice you give is the only thing that fixes that share.
Two things can reduce even the last of those. If the hour you released is taken by another client, the deposit is repaid in full, because the time did not go to waste. If you can show that the loss to the house was smaller than the part it kept, it keeps only that smaller figure. What goes ahead in the first place is set out under deposit.
A three hour session at EUR 540, confirmed with EUR 270 ahead. Cancelled two days out, all EUR 270 comes back. Cancelled at midnight for a two o'clock start, before she has left, EUR 135 is kept and EUR 135 returns. Cancelled while she is already crossing the city, the EUR 270 stays, unless someone else takes the hour.
A booking can be moved to another date once at no cost, provided the request reaches the thread more than twenty-four hours before the booked time and the new date falls within fourteen days. The whole deposit travels across with it. A second move, or a move asked for inside the final day, is read on the scale exactly as a cancellation sent at that moment would be, and whatever the scale does not keep goes on to the new date.
Then the choice is yours rather than the house's: the deposit back in full, or held as credit against a date you have not chosen yet. The full wording, including force majeure and a session ended early, is on the booking terms page.
Two lines settle it: where the room is, and what time you want someone at the door. The answer comes back with a name, an arrival window and the whole figure, whatever the clock says.