Absolutely wonderful stay in San Sebastián!
The flat is very clean and spacious, perfect for two couples to stay. Living room is massive and provided more than enough space for dinners, card games and a movie night. There are also two really nice bathrooms with excellent showers.
The beach is less than a 3min walk which was brilliant. The old town is around 20min away, but given the amount of food we were eating it was actually nice to have a leisurely beachside walk to and from the multitude of pintxos restaurants. There is also an underground parking space provided (although around 5-7min from the flat) which was really useful.
Will definitely look to stay here again if we get the chance.