Monse's place is perfect for a couple staying in San Sebastian.
It is located right in the middle of the old town, close to plenty of bars and restaurants. The apartment is comfortable and very thoughtfully decorated, very cool.
Air condition works well, we were there during a very hot period and we were very comfortable. No problems with street noise, with the windows closed we could hardly hear the outside world.
There are two fruit and veg shops on same street, very good quality.
The beautiful beach at La Concha is about five minutes walk.
I would strongly recommend this apartment and I hope to return some day.
Tip: try the Tortilla at Bar Nestor (downstairs), it is possibly the best I have ever tasted. But you have to order in advance, I think at 12:00 and 19:00. You will see the queue forming about 30 minutes before. It's worth the wait.