I've been going to Biarritz all my life, and in my opinion there is no better location than this. Overlooking the Grande Plage and exiting via the pool area directly to the road next to the promenade. The window and balcony overlooking the ocean are brilliant, and use of the pool was a welcome added bonus.
The check-in with the host's agent was seamless, and the host was very receptive to communications. Nice apartment which is perfect for a short stay.
The only disappointment was the cleanliness. Upon check-in there was someone else's used coffee pod in the sink, and remains in the bathroom bin. The floor looked like it had coffee splashes and had not been vacuumed up against the edges, whilst other areas such as the toilet and vents looked as if they had not been cleaned properly in a long while. My understanding from how most rentals work in Biarritz is that there is an external person or company that does the cleaning and so this is not a reflection on the host, but it was the one thing that lets this lovely apartment down.