I stayed at the flat in Pessac during my whole semester abroad and it was just perfect in every sense. Mathieu and his family are extremely helpful and always tried to helped me when I had problems (e.g. language problems, health issues) in daily life situations. I always felt really welcome during my stay.
The flat is located in a safe area, has everything which you need for a long term stay, and you just have to walk a few minutes to the next bus stop. I can really recommend that flat for a stay in Pessac.