We stayed at this apartment for 5 nights in May 2018 and had a great time.
The apartment is clean, well appointed and very conveniently located close to both Zurriola beach & old town San Sebastián. The street this apartment is located on has many great places to eat & drink, and there are many others within a short walk.
Our welcome was perfect: friendly, short & to the point. Maps of the city & recommendations were given.
There is very little natural light in the apartment, due to the windows facing into courtyards rather than on to streets/ outdoor spaces but the lighting is good so that did not impact us too much. We preferred to be out & about seeing the city anyway!
Would wholeheartedly recommend this location.