We thoroughly enjoyed our stay at Maria Jose's apartment. It was a terrific experience.
To start, our host was incredibly warm and welcoming. As I don't speak Spanish, we communicated through Google Translate. In spite of that, she welcomed us at exactly the time we arranged – with snacks and wine!
The apartment's location can't be beat. It's in the Gros neighbourhood – a few blocks from the Zurriola surfing beach, and away from the chaos of the Old Town (but still walkable there in 10 minutes). Surrounding the apartment are a wealth of bars and grocery stores.
The apartment itself is very well appointed. It has funky decoration and is neat as a pin. We were two couples, and there was more than enough room to spare. In fact, we had an entire room to spare. I would say it would comfortably sleep three couples, with two couples sharing a bathroom. (Eight is possible, but might be tight.) The kitchen and laundry all worked perfectly, and there are basic small appliances to use.
The apartment is part of a larger house (where the host lives), but we never heard a peep out of them. It's very, very quiet.
A huge bonus of this apartment is parking – which is near to impossible to find in San Sebastian. It's very secure and easy to park in the private, fenced lot.
I can heartily recommend this apartment for anyone staying in San Sebastian – we would definitely use it again.