@Lizzie - thanks for putting it in the Feature. You've made this great landing page that I almost never go to the actual forum beginnings anymore, prefering to navigate from the Top, Recent, Unanswered.
As for this policy, it's a start. But you know me.... I have questions:
From which of the 3 categories we score them on, is the 3-star limitation going to kick in? Any of them individually or an average of all 3 scores?
And then, for those hosts who have the limitation of "positive reviews from past hosts", does a 3 star mean that they don't qualify or is it still only the thumbs up/thumbs down? And how many 3-star scores do they need to get before they can't instant book when this criteria is turned on?
Does a guest get a nasty-gram from Airbnb if they get a 3-star score from a host?
The tough part about this is that some times there are perfectly nice people but it's just not the right fit - especially for the home-sharers. As an example, I'm reminded of a couple of host stories where they had guests wandering around in just underwear or towels and that really bothered them. That kind of behavior, unless explicitly spelled out - you must wear clothes at all times - doesn't really fit in the 3 scoring categories: Cleanliness, Observance of House Rules, or Communication, but the hosts doen't want them back because its so uncomfortable to tell people to get dressed and it's clearly a matter of style. Another host found it really uncomfortable when guests went into the bathroom together and what's she going to do, write a house rule that states one guest in the loo at a time? Silly. And there was that one host who had a guest sort of torment her cat. Now all of these three examples can be addressed by the host - please wear clothes, please don't go into the bathroom together, please leave my cat alone - but do you REALLY want this guest back? So how do you mark them down so they don't, I mean, none of their behaviors are against any of the criteria and you can't mark them as thumbs down, because, as a host you know it just wasn't a good fit for you. It's tough and very nuanced for sure.
As I said - it's a good start!