We booked a room at Garazi's very last minute and we were lucky to find it. The room is very good value for money, perfect if you want to be in San Sebastian but not spend a fortune (you get to the centre v easily by metro). It is a bit strange not to have access to a living room/kitchen, but this is noted in the description and is because the house is actually inhabited by Garazi's father, who lives in the apartment. He is very friendly and I wish we had had more occasion to talk - the lack of a common space makes that unlikely to happen.
Overall, pleasant stay. Since there is no access to a living room/ kitchen, I wouldn't stay for more than a few days, but for a long weekend or so it is a very recommended solution.