If you are visiting San Sebastian then this should be your first choice. We stayed in this apartment for 3 nights in June 2011 and found it exactly as described on the website. it has everything needed for a stay in this wonderful city.
La Concha beach is across the road from the entrance and the old quarter of San Sebastian is a short walk away. The apartment is well equipped and was spotless for our arrival. The owner's mother in law who introduced us to the apartment was charming and helpful.
We are happy to recommend this apartment to anyone visiting San Sebastian. If you're not planning on going there, you should. It's a great location for food, sightseeing and relaxation.