We stayed at Marguerite's flat in Bayonne for four nights in August and it was fantastic. Great location, right on the edge of the old town and easy walking distance to loads of lovely restaurants & shops. Plus there was cheap parking nearby where we could leave the hire car. It felt very safe and the flat is lovely - very comfortable for two couples to stay.
Marguerite was lovely too - very helpful, especially when we left a suit jacket behind by mistake and had to fix up coming back to Bayonne a few days later to collect it (thank you Marguerite!).
I would highly recommend staying here :)