The Electric shower I believe needs to be looked at urgently. When I tried to use it, when switching to "High" it released and awful electrical burn smell that "cholked" the room and I had to open a window and shut the bathroom door for a couple of hours.

Location

Main room has 3 outside walls and each is a cold bridge in winter with insufficient radiators/curtains so we were cold. For a short stay one wouldn't fire up the log burning stove as no logs around.