Here are my comments based on 5 C's.
Comfort. no problems here. all good. beds were fine. super shower. well equipped kitchen.
Convenience. excellent. 15mins walk into town. public transport to town and to Biarritz is about five mins walk. parking is on the street and we always found a space.
Character. the decor is shabby chic. it created a great holiday feel. it's a cosy place.
Calm. it's in a quiet street in a quiet neighbourhood. the apartment is in a big building with other apartments but there were no noise issues.
Customer care. excellent. We arrived early than planned and it was no issue to check in early. good, open communications. very warm welcome. answered all questions and even checked in on us to see that all was good. Blandine is a great host