Hello there!

I used to live in Charente-Maritime (my parents still do). It is very pretty but depending on how far you are in the countryside, a car is a must! The summers are usually invaded by tourists but you learn how to avoid the "hot spots".
My favorite city is La Rochelle. Very old, pretty yet modernized. You will also find a french teacher more easily. But as you are not far from France, I recommend scouting. Each individual wants something different. Poitou-Charentes is about 2 hours and half on TGV (train) from Paris.

Keep us updated on your search!