Overall the apartment is good, and San Sebastian is amazing.
The location of the apartment is fantastic. The view is incredible - particularly at sunset. This was a major plus for us.
The Gros area has lots of good bars and restaurants. And you are only a 15/20 min walk along the seafront to the Old Town.
Nekane who welcomed us was very helpful, and gave us lots of information on what to do and where to go.
The decor in the apartment is quite dated. If you are looking for somewhere very modern, then this isn't for you. But as a base to explore and relax it worked well for us.