Inaki's apartment was perfect for our stay for four people. The living space was a good size - though of course we didn't spend a lot of time in there - the bedrooms small but comfortable and the good-sized kitchen equipped well, and it has a sheltered terrace. The bathroom was small but as the rest of the apartment it was sparkling clean when we arrived.
Inaki welcomed us as arranged and gave us lots of useful local information.
We arrived by car and our friends by motorbike and we managed to squeeze both into the secure underground garage, which was a huge bonus.
The apartment block is in a nice residential neighbourhood with a pleasant atmosphere, and there are cafes, a couple of bar/restaurants and food stores close by.
We found it an easy, pleasant 30 minutes' walk to the edge of the old town and there's a regular bus service to there from just outside the apartment. A taxi back from the old town was less than 7 Euros. One tip - the shortest walking route to town is through a park and across a footbridge that close at 22h30 - the longer walk around adds about 15 minutes, as we discovered!
On previous visits to San Sebastien we stayed in the old town; we found this location much less intense and the car parking was a huge plus. The train station is about 15-20 minutes' walk from the neighbourhood.
We enjoyed visiting the Tabakelera Culture Centre that is about 15 minutes' walk through the park.
Muchas gracias Inaki.