Even though this listing is down as sharing with the host, it's about as seperate as you can get. We stayed in a room on the ground floor which was out the back of a larger room they use as a venue for jazz evenings in winter. There is your own private shower/toilet and you can come and go as you please and not disturb anyone.
The wifi is a bit weak in the bedroom so you have to use it in the larger room. As other people have mentioned, it would help to know some French for communication. Claire was a lovely host and left breakfast out for us when we didn't make it upstairs at a reasonable hour!