I include a one paragraph summation of Airbnb's review system in a one page 'cheat sheet' of the most important house rules and house use instructions that I lay on top of my House Manual (I do the cheat sheet because I have learned guests do not read much of anything, including my House Rules as listed on Airbnb, even though they supposedly 'agree' to them). I do not tell the guest what rating they should give me. I simply explain that anything below five stars can cause a Super Host to lose their good standing on Airbnb.
Most all of my guests have thanked me for pointing this out. Many guests expressed surprise and wondered why Airbnb would lead them to believe that a 4 star review is 'good'.
I wonder the same thing.