We stayed here while visiting San Sebastián in mid-October. It is a clean and comfortable, well-appointed, secure apartment. There are a couple of elevators but the apartment is only a few shorts easy flight of stairs up..
There are 2 ensuite bedrooms at opposite sides of the apartment so it is perfect for 2 couples. Kitchen is well equipped. There is a washing machine (but no clothes dryer).A clothes drying rack is provided which did the job.
The position is fantastic, literally less than a 2 minute walk from the beach, 4-5 minutes from old town, with most things you will need as a tourist being within an easy walk. We parked in the large La Concha parking lot (approx €25/day) . The apartment is literally diagonally across the road from the elevator exit less than 100m away., so very convenient.
We had a great stay and would recommend this property.