@Ann72 or anyone else, do you know where it is written what 'recommended by other hosts' or 'guests who have received positive reviews' (the only descriptions I can find on the Airbnb help pages) actually means?
If it is based on the star ratings, what is the actual level at which the guest's ratings become unacceptable? I really hope it's not 1*.
Personally, I have never had a guest IB with anything less than a 4* overall rating (maybe even 4.5*). I certainly would have noticed if they had 3* or less, but I don't remember ever seeing that with an IB.
I've also had guests try and fail to IB with me and they couldn't understand why. They had verified ID, but when I checked their reviews, there was at least one host who wasn't totally happy with the experience. I always assumed that in these cases that host had clicked 'would not host again' (or 'would not recommend' or thumbs down as it used to be) as the guests did not have really low star ratings.
I would like to see some sort of clear documentation from Airbnb explaining how they define recommended by other hosts. I imagine they have kept the wording super vague for a reason. Perhaps hosts would not be reassured by this requirement if they knew how low the bar was set...