Cancelations made more than one week prior to arrival: you can cancel the reservation, but you will not be given back the 20% under any circumstances, nor the administration fee, which you will have already paid.
Cancelations made in the week prior to arrival: if you cancel in the week before you are due to arrive, Barcelona4Seasons has the right to charge you a 10% of the total amount for the reservation as a cancellation fee, and under no circumstances the deposit nor the formalities fee will be given back.