I really enjoyed my stay at the Carlton. There was not many residence which made it feel like I had a palace to myself. At night it can be mysterious as the lights in the lobby and hallways are off by default and turn on with motion sensores after you enter. But i enjoyed the mood!
The room had all the amenities that I needed and the loft bed was extremely comfortable, though I recommend being careful when climbing up and down the loft stairs. The location was really close to the north end of the beach (2 min walk). From there you can easily walk down the beach to more shops and center of biarritz. (10-15min)
All together I really enjoyed my stay and appreciated timely communication from my hosts Sebastien and Michael.