We had an amazing stay at Asier's apartment. It's in a great location relative to the beach and both the touristy and more local pintxos bars. We were a group of 6 and there was more than enough room for us. Only slight knock is the apartment overlooks a town square which gets pretty noisy in the mornings. But that also just makes it more authentic.
Asier himself was really accommodating on both check-in and check-out, and really helpful with information about the area. A great host!