Our stay in San Sebastian was fantastic! Rosa was very communicative and welcomed us with a lot of information about the area. Public transport was super easy with a bus going directly into town. We found this to be the best option (after we tried driving one evening). Especially since the apartment had a secure undercover park for our car.
The apartment was exceptionally clean and had everything we needed. All I would mention is that the only bathroom is an ensuite to one of the bedrooms so you have to be pretty comfortable (or a heavy sleeper) with the people you are sharing with.
All in all, it exceeded our expectations and we would not hesitate to recommend this apartment to anyone wishing to be comfortable and have a lot of space whilst travelling. We would stay again when coming back to San Sebastian!