I write in English because it's much easier for me;)
The room we booked an Jins flat was great! It was really cozy, extremely clean and the whole atmosphere was nice, forthcoming and a pleasure! Jon and his wife did anything they could to help us when we had questions and made everything possible to spend a good time in Zarautz! Really great is the location of the flat...you are within a 5min walk at the beach of Zarautz and by getting out the door, directly in it's pulsing night-life! All in all very recommendable ;)