We had a great, albeit brief, stay at this lovely apartment in San Sebastian Old Town! The location was just perfect and it made for a comfortable stay. Only 5 minutes from the underground parking in "Boulevard" (exit closest to the beach end of Boulevard and your straight in to the old town). We were escorting my slightly less mobile parents (70 and 80 y/o) and the distance wasn't bad at all.
The apartment was nice and quiet (double glazing all through) and had been thoughtfully decorated. No views, but that's not what you stay in the old town for! SUPERB location for exploring the city at night and also for the beach during the day (depending on the time of year you come). There is a lift up to the 2nd floor which was handy after all the Pintxos and Sangria in the evening.
In terms of costs, it is expensive everywhere in San Sebastian during the summer (July through early September) but we were happy with what we paid and the service / apartment were fantastic. Our 3rd stay in San Sebastian and definitely our favourite accommodation so far. You won't be disappointed!