Good location, clean and good value. The flat has three rooms (1 double bed and 2 single beds). There is one bathroom with shower and the kitchen is equipped with a washing machine, microwave and toaster.
The area is quiet and feels safe. It takes about 20 minutes to walk to the old town of San Sebastian along the river, which is just 2 minutes away from the flat. Great for runners. There are buses if you don't want to walk after the feast of pintxos, and a taxi costs around 8€.
If you are driving into San Sebastian and are looking for a place with parking nearby, bare in mind that the closest free parking is about 10-15 minutes away from the flat under the motorway. It's free but there are only 30 spots or so there. You can park in the area around the flat for a max. of three hours for about 2-3€ but you'll have to move the car again after that. Between 8pm and 9am parking is free.
Bring your earplugs if you are a light sleeper as the walls are quite thin and you can hear the neighbours.