Alberto's apartment is a great place on the edge of the city which is a great launching pad for exploring both San Sebastian and the rest of the Basque Country. It is a beautiful and comfortable place with a big yard, a grill and a community pool that you can all access in the building complex it is situated in. There is also a convenient off street parking spot along with plentiful on street parking if you're planning on having a car. I'd highly recommend it for groups.