I'm delighted to see the spirit of the original Airbnb is alive at yours @Elisabeth40 !
I sympathize completely with your views re guests who have wrong expectations because they don't READ, or because the wrongly view Airbnb as a cheap hotel, & have not bothered to familiarize themselves with the 'ordinary room in someone's home' ethos. - Which still exists at yours & mine!
Personally I've been lucky, and only had two rude reviews from disgruntled guests who didn't understand what they were booking, nor the Airbnb concept. Most newbies gave 5*, with the odd lower rating explained by newbies not understanding what ratings mean.
I actually disagree with guests not being allowed to rate for the first 5 stays. If that were the case I would have very few reviews to promote my listings, as I host many first timers, and most guests have fewer than 5 reviews/stays behind them.
Some hosts solve your problem by educating guests on reviews. - By subtly bringing the conversation round to reviews, so you can encourage them that reviews are not meant to compare to a 5 star hotel, but rather to the listing description written by the host. - So a stay that was as expected from photos & description = 5 stars. Some hosts put a little notice in the room, explaining. Some hosts explain how/why 4* is failure in Airbnbland.You have to be careful that you word your talk/notice/page in house manual in a way that does not antagonize the guest; not make them feel bullied or pressured into a top review. That could be counterproductive!
I was going to advise you to be very clear in your listing descriptions about anything a guest might find fault with.... But I looked at your listings, and you have done that already! - I guess you could try & put the same information more briefly? Use bullet points?
I'm rather glad to see there are still hosts who list their sofas! I've seen too many posts criticising similar! You can list anything you like, so long as the description is clear! - But the guest has to read it!