@Lizzie, as @Branka-and-Silvia0, I also have guests that give 4 stars and plan to return happily, quite often. And then I get those guests who book against all advice and have all the issues I raised before (from features of the listing to a daily work trip to the other end of town). Then they leave a 3 star reviewwith an infuriating text like "Helga does ger bedt (poor little thing it's her best, she can't help it), but the place is small, but the congress center is far away etc. I get just enough of those to never make superhost. It would be great, if they get a pop-up when they click at 3 stars: "You don't plan to return to this place, ever?"
because they do return, next time in the same situation: bad planning, ladt minute everything is too expensive, but there is this "budget place", which still did not become the Ritz since last time. So either think if it's as bad as that or don't rebook.
My personal limit is 3 stsrs. If they give four, that's their opinion, if they give three in my place it's an insult or stupidity and I don't want to see them again in either case.