Thank you for the clear shot of the front of John's chateau.
Yes, there are quite a few. I found this one, that appears to be the Chateau de la Brosse when it was for sale. If it's the right one or not, I don't know. However, three clues that it could be the correct one are:
1) It has two kitchens - I remember the Falafel Queen (Dana, for those who don't know) was over the moon about the two kitchens in one of the vlogs
2) This listing says the main house was restored and the extensions needed to be restored. I believe Stephanie said that when John bought it, the main house was restored and he was moving on to the other buildings
3) On the floorplan where the bedrooms are, if you look at the layouts, there is one bedroom where you have to pass through to get to another bedroom. Unless I am confusing it with something else I've watched (and I watch a TON of vlogs with Italian property for sale, so it's likely I get them all confused sometimes), didn't Stephanie mention this in one of the vlogs when she was showing the bedrooms?
chateau-de-la-brosse.fr