If you're going to list "hot water" as a feature of the property it needs to be sufficient enough to have a shower. Hot water lasts about 60 seconds in the shower, this is unacceptable. You need to fix the water heater, I have used these often in the past. This one is broken.
Also you need to upgrade the bed to AT LEAST a Queen sized bed!! What the hell are two adults doing sharing a DOUBLE!?!?
I would not rent this cabin again simply because I can't get a shower or a decent nights sleep.