The apartments are really nice and have everything you need to spend a weekend in Zarautz. We had a late check-in but haven't had any problems with it: we were met by the host and got the instructions. The place is close the beach and have a lot of restaurants, shops and surf rentals nearby.
We liked staying in this place, I recommend it. Hope to visit it again and spend more time here!
Thank you Gorka and Saioa for your assistance and hospitality! Hope to get tips about spots near Zarautz the next time :)