No WiFI and no connection with your own mobile data. At all.
If you don't need WiFi or mobile internet connection, this is a very nice place. But internet connection is not possible, the host excuses with 'the walls', but that doesn't really solve your problem, if you need internet.
The room itself is comfy and clean. The bed is very comfy. The place is quite noisy because of 5 big heat pumps running just outside the room in the patio, so don't pick this place, if you like silence. The family obviously didn't try to stay in the room themselves, before describing it, and they ought to pick a better internet solution, if they want to sell this place with WiFi.
However the place i situated in a lovely spot, very central and close to a nice park and the beautiful city center of lovely Bordeaux.