Kinda depends on the local weather and how much property surrounds it for their use.
If one has a wilderness, these make cute and inexpensive “cabins in the...” provided there isn’t much winter. I’d also consider the expense of heating and cooling, and how easy they might be to break into. Better would be several, linked, with a nice courtyard between. I can see some of the appeal of this simplicity, but if I did this I’d have to give up the library, the museum, and the various hobby zones.