This is a clean, minimal (in a good way) apartment is in a quiet suburb of Donostia/San Sebastian. It is reasonably well equipped, has fast wifi and a garage (but not suitable for a very big car!) It's about 15 minutes walk to Gros and 25 minutes walk to the old town, with plentiful buses (with stops very close to the apartment) that will get you there much quicker. Local amenities include a very friendly bakery/coffee shop, pharmacy and grocery store.
The apartment appears to be quite new, but has clearly seen better days (which is a real shame). Wardrobe doors did not work (had come detached from their rails) and the kitchen door (made of glass) had been broken, with shards of glass been deposited on the floor when it was moved - something we were concerned about with two crawling infants in tow. Aritz provided some tape for us to patch up the kitchen door, when we brought the problem to his attention.
Aritz was very friendly, and was able to provide us with two cots and two high chairs at short notice. We had a problem with some very noisy/anti-social guests staying in an adjacent apartment, and Aritz was very quick to respond to - and resolve - our complaint.
Apart from the unruly neighbours we had a very pleasant stay. I'd certainly stay there again.