@Alice425 Given that guests are led to believe by Airbnb that a 4 star review is 'Very Good' and a 5 star review is 'Fantastic', yet, going forward we can be removed from the platform if we 'consistently' fall below 4.7, I believe it is important to educate guests about the reality of the review system, but in a non-intrusive, casual way.
Therefore, in my one page 'Cheat Sheet' which includes my most important rules regarding hot tub care and use and septic system sensitivies (given that most guests do not read our House Rules, even if they say they have), I include a brief note saying 'Airbnb's Review System Is Not The Same As A Hotel' and I give a brief blurb that five stars means that the listing description and photos were accurate and that the overall experience was excellent and that feedback from the guest in the form of a review will help future Airbnb users to determine if our beach cottage is the right place for them.
I also mention that Airbnb's review system is similar to Uber's in that anything less than 5 stars is viewed as less than acceptable by Airbnb. I also ask guests to let me know right away if they feel they are having less than a 5 star stay. I do not specifically ask for a review, and I do not ever ask for a 5 star review. I have a very high review rate since opening, even before I added all this into my 'Cheat Sheet' (over 90% last time I looked). Guests do seem to be enthusiastic about their experience and they do the review without any prompt from me beyond the Cheat Sheet.
I will also say that guests have thanked me for educating them about the realities of the Review system, saying they had absolutely no idea that anything less than a 5 could trigger warnings to the host, etc, from Airbnb. They also wondered why they are told '4 stars' is 'Very Good' by Airbnb when we hosts know that it is not. I wonder the same thing.