Adam's place is a great little studio is a perfect location, literally 1 minute by foot to the beach - plus it's on the top floor, and the view is spectacular.
It's small, but has everything you need. It does have a shared toilet (which was spotlessly clean), as Adam points out in the description, but apparently I was the only one using it, because I didn't see anyone else on the floor the entire time I was there - and this was in June!
There's a quiet bar/café on the street below, which made early mornings great; there are 3 bakeries within 1-3 minutes by foot; a Casino as well as Carrefour grocery stores also within 2 minutes by foot.
I go to Hendaye at least once or twice a year, and will certainly try to get this place again.