We had a great time in San Sebastián/ Donostia and I would stay at Edurne’s place again.
Edurne’s place is very centrally located and it was easy to walk everywhere. There was no air conditioning but there were a few fans, which made it just fine.
There was a festival going on in the city during our stay, so it was a bit noisy at night, but I was able to sleep fine with earplugs.