Stayed at Elena and Donatos 9th floor flat for a couple of days - selected because it slept 3 people. It is a good 25 minute walk to centre of San Sebastian (San Sebastian is known locally as Donastia), but the buses are cheap and frequent (1.75 euros for single ticket to centre). It's located in a poor part of town, but it is safe. I had to park my hire car 15 minutes' walk away from the flat, but it was free parking so mustn't grumble too much! Flat is located off Elena and Donato's entry hallway, but we didn't feel that we were imposing on them. Not as clean as you might expect, but good enough to use it as a crash pad.