Clean, cozy and well-equipped apartment. Towels where provided and the beds are very comfortable. The communication with Borja was perfect, and the on-line check-in is really convenient! Unlike other comments, we did not have a lot of noise and we slept well.
However, I will not recommend this place if you plan to go out late, finding a parking spot around the block after 9pm was a real nightmare (we had to park on unauthorized places, luckily the police are tolerant).
Furthermore, the private parking is not in the center of San Sebastian, but 10min walking from the old city center and the beaches.