The apartment (part of his family house) was as gorgeous as the pictures - modern contemporary style with amazing view of the beach, fully functioning kitchen (we cooked dinner), nice balcony for afternoon tea and spacious living area. The whole apartment was clean and well-maintained. The location is convenient, 8-10mins drive or ~30mins walk to the old town.
If driving, there are plenty of parking lots outside the house. However, note that you have to pay for parking, even on Sundays. Traffic police in Donostia are very hardworking, so don't try to cheat on parking anywhere. When in the city, recommended to park in the underground car park as those have no limit, unlike those overground (usually max 1.5hrs).
Martin was very helpful, welcoming us when we arrived and was very responsive to any queries via msg.
Marcus Wong
Singapore