Well located for the beach and the old part of San Sebastian. Great restaurants, bars and bakeries in the immediate area and a pleasant walk to the conference center, Tabaklara, Museo San Telmo, Urgull, aquarium and old quarter of the city. Also a reasonable walk from the train & bus station if that is your preferred mode of arrival and departure as it was for me. It is close to a fairly busy road, but since the apartment is facing the interior courtyard, road noise was not an issue.
As noted by another reviewer, there is construction in the adjacent building, so I recommend confirming with Borja ahead of time so you know to have earplugs on hand to ensure restful nights.
The unit is efficient in size but adequate for a single traveler, couple or family with one child for an extended stay. Appliances and fixtures were in good working order and the furnishings were like new and comfortable.