We have exactly what you are looking for, sleeps up to 17 adults in two houses, all bedrooms en suite, huge games/party room, heated pool and acres of private grounds. Not Brittany but only 40 minutes drive from Rodez or an hour and a half from Toulouse. This is us:
We need to find a house to rent next summer for a family celebration for 20 of us (10 adults, 10 kids aged 2-12), somewhere in France that's either a fairly short drive from a ferry port, or not far from a major airport. I've looked on Owners Direct & not come up with anything.
Does anyone know of any websites that would be good to search on, or even better, can recommend somewhere?