The apartment was spacious for the 3 of us. It was located outside of Old Town in a quiet part of town, however, it was only a 30mins walk away or 20mins with walking and bus to the Old Town. The area has a few restaurants and bakeries around and a number of small market and large supermarkets. The local train station was only a 8mins walk away, towards the football stadium and we found that to be convenient as we did a couple of day trips out of San Sebastian from there. Overall, we had a pleasant stay here.
There is no coffee or tea and oil and salt available like some of the other air b and bs I've stayed, so be sure to prepare your own. The soundproofing of the apartment wasn't great and we could hear the neighbors chatting next door in the evening.