I resided in the boat, a "nomad," but built three berths instead of two! I spent 4 months on the boat moored in Fen Ditton (on the river Cam) in the hope of living in a caravan if the rental came to pass!
http://canal.bendall.de/fen-mm11.html
it was comfortable the summer as I had a job in Cambridge, and was able to use the facilities of the caravan site!
It was fitted out with a two burner stove, a parrafin heater (yes, I know! but the heater was elevated and had ducts in the open!) and a fridge...
As I relocated to a caravan in the winter I can't reveal what a winter would be like!
Peter