Anael's flat is exactly as described - perhaps better than described in fact - and represents great value for money.
You will need a car, in my view, but then you can access everything you need very easily (in particular the Carrefour supermarket in Tarnos and the A63 motorway are both within a 10-minute drive, which was key for me).
It isn't luxury, and at times basic, but it's relatively new (built in 2015 I believe), and therefore well insulated, well heated, quiet, spacious and light.
Top of my list so far for flats in the Bayonne area, and highly recommended.