We had a wonderful stay in San Sebastian. we stayed with the four of us (we have 2 kids of 7 and 4). The appartment was well equipped, spacious en eventhough in de middle of the old city it was nice and quite. An absolute asset is the roofterrace, which we really enjoyed. The beaches are a 5 minute walk (at most). I would definately come back if I were to visit San Sebastian again!