We had a great time staying at Marijo's, the bedroom we rented is really big, coupled with a large bathroom and a terrace with a view at Biscay Bay. Very quiet and private, we have barely heard the other people at the house. At night you only hear the ocean. Marijo will give you a separate shelf in her fridge where she'll put fresh fruit and eggs for you to make breakfast, she's also making her own fantastic bread every evening. The place is not far from San Sebastian, and best way to get around we figured out is to take a car to the nearest bus stop (3minutes), then take bus 16 to the city center (25minutes). You may want to risk going to San Sebastian with a car in the early morning, otherwise finding a parking spot is difficult.
Tldr: one of the best airbnb stays of all time 5/5 highly recommended.