Location is perfect and wonderful crashing waves can be heard from the balcony doors which I left open all night as the sound is addictive.
The flat is very clean but spartan, not homely. But it has the necessary except the shower is a hand held hose you can’t hang up and unfortunately it ran out of hot water after two minutes when I was there - an unpleasant glitch they’ll fix no doubt but I’d advise you make sure you test the shower on arrival.
Biarritz is beautiful and lovely walks each side of the flat, great location in lovely peaceful setting.