Willy was an amazing host from the very beginning until the end. The place is amazing, and just a few minutes from the beach and from Larrabasterra's metro station (around 10 mins walk). The space is perfectly clean and totally comfortable for up to 4 guests (we were 3, but you have one double bed and one double sofa available).
I would totally advice to book the place if you are planning to visit the Basque coast anytime soon.