|Subject: re: France throughout|
A reliable guides to B&B's are those of Gites de France. The Chambres d'Hotes are carefully checked. I know several of them in my region of Provence that have the seal of approval and found them all up to standard.
You can check their website: http://www.gites-de-france.fr where you can also book on line. However, they do not list much information on individual B&B's, and from what I heard from the other side, the owners, many prefer not to go through the central booking (because of the extra charges). The best way is to buy one or more of their guides, listed by region or theme. Unfortunately, because there are 55000+ gites, you end up with a lot of guidebooks for your extended trip. Nevertheless, I hope this helps,