2 of us stayed for a week and really enjoyed it.
The flat is very stylish and has everything you'd expect, we stayed in a couple of nights and cooked with no issues.
Great location; the Grand Plage beach is less than 5 minutes walk away and you can get into town very quickly too. It's also very near a big bus stop / tourist information centre if you want to head over to Anglet, Bayonne or further afield.
Benedicte was a great host and communication / check-in were very easy, would definitely stay again if we're back in Biarritz.