Don't make any assumptions about this facility. None.
Don't assume that the caravan is up to date, serviceable or as depicted in the photos; that it is connected to mains water; that it is equipped with serviceable utensils or crockery; or that there is basic electrical safety that you would get on any campsite. It might be wise to ask to see certificates of basic gas and electrical safely that you would get if renting a caravan or motorhome anywhere else.
Don't assume that you can open the windows or even see through the main one as depicted in the photos. The main window has been replaced with a sheet of perspex which is totally obscured with age. I'd post photos on here if I could.
It is not "one up from a tent"; we feel it is one down from our tent at home.