The apartment is beautifully furnished, spacious and clean. Because of its location underneath an arcade the view over the plaza is very limited and makes the place quite dark.
There is no personal contact with the hosts - it is all managed through an agency which is not within our perception of how airbnb operates. Take your own hand soap, dishwashing liquid and tea towel if you stay longer than two days. Cooktop doesn't always work.
The location is very central - right in the heart of the historic city and very central to the beaches and the beautiful city centre of San Sebastian. But be prepared for party noises all through the night especially when there is a festival on (e.g. regatta) but on weekdays as well. The back bedroom is ok in terms of the noise.
Since the location is within the historic centre, there are no cars (and taxis) allowed. All luggage has to be carried quite a bit through the alleys.