Isabelle, the owner, really does make you feel like a guest in her home. I can't think of anything you would want that she doesn't provide: large clean rooms, good bathroom with plenty of towels (and toiletries!), tea & coffee, free secure parking, enormous range of guidebooks, maps & brochures to borrow.
Cognac is not as pretty as Jarnac, but it is undoubtedly the best centre for touring the area; from this house you can be on the free motorway east/west in five minutes, which means you can cover the region comfortably in a few days
Very highly reccomended.