Suisse Normande has a lot to offer, especially if you enjoy the great outdoors - forgot to mention that we saw 22 parapentistes almost overhead on our last day; there is a school at Thury-Harcourt, I think.
The river Orne is great for kayaks -there are several places, including Clecy, where you can start and be picked up several hours later downstream.
Ref the Garden House, Clean, reasonably equipped for a holiday home - and the owners are really prepared to put themselves out to supply information or practical items that you might need. Vast basement for all the children's stuff, ping-pong, wet clothes, etc.
The garden is enclosed, plus the gates are gadget controlled, so young explorers should not be able to go far. The road serves four other neighbours, and diminishes after a hundred yards to a footpath, so there is very little noise. more