This unit is at the heart of the old town, a quick short walk to anything you want to do in San Sebastian, including excellent bars for pinxtos. It is a well furnished comfortable place. Even though you are at the heart of the city, it is super quite as the apartment does not overlook the main street. We arrived and the fridge was already full of stuff more than we need.
Our host, Luis, showed exceptional hospitality. He provided as with great tips for where to eat, including (hard to make) reservations for Michelin star restaurants. He also showed us his local favorites in person and was constantly in touch with us when we needed any information.
I do highly recommend this unit and the host (we only met Luis in person in this instance).