This is a very nice newly renovated apartment and after spending 3 nights in it we found it to be in pretty much the perfect location as a tourist in San Sebastian. This area is just a pleasant five minute walk south of the beach and old town, and close to the railway station too. There is a small supermarket and meat/vegetable market 2 blocks away. There are mostly higher end stores on the ground floor in the area, so during the day there are plenty of pedestrians and street life, but no real noise in the apartment, especially on this street. At night it is super quiet. In the old town on the other hand it is a noisy zoo at night. We ate in the old town 2 nights but were glad not to be staying there.
Maria was very nice during the key handoff and gave us all the info we needed.
My only real complaint is that we didn't really like the mattress on the bed. There is something weird about it, to the extent that we both got some back pain after sleeping in it. It was especially bad the first night. We have no problems sleeping on our bed at home, nor any of the 6 hotels we stayed at before and after this apartment. It seems like the mattress has some sort of very soft foam on top of a very firm (maybe no springs?) base. As they say, your mileage may vary...