Astrid
I can really recommend this school! I stayed for two months (oct-dec), and I wish I had stayed even longer.
The teachers are very engaged, and they both helped me progress a lot in my French while also making me feel at home at the school and in Biarritz. The classes focused a lot on speaking, which I really appreciated, and they often arranged different activities for us to get to know the area.
An extra plus is that the school is just a short walk from the beach. This is truly a school for anyone who takes their French learning seriously, as well as for those who just want to have a great time in Biarritz. I hope to be back soon.