We only stayed briefly for one night, but the experience was good, and we recommend. Xavier is a very responsive communicator, and both check-in and check-out were very smooth. It's a typical chambre de bonne.
Do note that the room is very small and the ceiling beams are fairly low. The bathroom is separated only by a curtain, so it's not the most private (and home instructions state that one must not shower after 10pm due to noise).