Positives: the is a lovely apartment, perfectly situated and spacious with a great view. Yes it's a little dated, but spotless, with new appliances and a modern bath. The roof terrace is lovely and catches the sun. It was quiet when we were there (April), no noise from building or nightclub as reported in some reviews. We would definitely use it again and plan to return to San Sebastian next year.
Negatives: the shower head does not fit the wall fitting; it must therefore be hand-held which is annoying (v difficult for a woman to wash hair). The only mirror is in the bathroom, and one (with a small dressing table) in the bedroom would be good. These things could be fixed in less than an hour.
As per other reviews, it would be nice to have some basics: coffee filters, condiments provided. But the Spar is 100m away.