We spent a great weekend at Jon's place. He was a great host, even if he didn't know when we were going to arrive, we could always call him or leave him a text message.
Though, not being the newest one, the apartment is really beautiful and the view of the ocean is simply amazing. In the flat you will find recommendations of local pintxo bars to help enjoy your stay.
The beach is right in front of the apartment and the old town is about a 10 minute walk. As the flat is next to Zurriola (quite a big street) and a night club, during the weekend people who are sensitive to noise, may have some trouble to sleep.
So overall, we can highly recommend Jon's apartment and we would definitely stay there again.