@Di69 There are different levels of mess. Airbnb guests are expected to leave the place reasonably clean and tidy, regardless of whether there's a cleaning fee or not. Things like washing your own dishes and making sure the garbage is in the bin, rather than strewn around everywhere are expected- cleaning fees cover the heavy duty cleaning like vacuuming, washing floors, clening windows, making sure all the counters and fridge and stove are clean, mopping the floors, doing laundry, making up the beds and putting out fresh towels and amenities. Many times the cleaning fee charged doesn't actually fully cover what the host pays the cleaner, or how much time it takes to do all these things if the host does their own cleaning.
But of course, it's ridiculous if a host marks you down or leaves a bad review simply because there was some hair in the bathroom or you left a couple of dirty coffee cups on check-out.