I booked this place for my family. Their feedback:
+
Great location to discover Zarautz by foot, everything is nearby.
+/-
Just in front it is loud due to restaurants but you sleep at the back so in the end it's fine.
-
The parking is really small, my parents succeeded with ford smax but sketchy and without closing the garage door.
It's impossible to reach the appartment with the car because there is an "only walking" zone.