I agree - I don’t consider the 5 stars to be a rating like a hotel rating where 5 stars = gym and swimming pool .
If the listing is accurate that’s five stars for me , I’m not rating the location or what facilities they have.
We have house sat in homes that range from ones with tennis courts and swimming pools and some modest small mid terraced homes . They were clean and comfortable and accurately described in the listing . Hosts at both were hospitable and welcoming . They all got five stars .
We also stayed at a large property in a great location with a hot tub and pool . Kitchen was dirty , living room and guest bedroom was thick with years of dust on the velvet curtains , lamps ( and the vacuum cleaner was broken so no way to clean up ) - we did not give that sit 5 stars .