@Katherine347 yes I am probably not doing this the right way as I have only ever rejected one guest who had no reviews and that was because he wanted to have a bridal party of 16 people with a dog getting ready for a wedding at my cottage that sleeps 4 and then rotate the lineup of who was staying on different nights. Just can't accommodate that and I could see my cleaning adventure after such an event. Reviews are fairly useless for guests unless hosts are super honest and most are not. They don;t describe annoyances like little kids leaving jelly all over the espresso machine or every sheet, towel and blanket being dirtied in a 48 hour stay. It has to be really egregious for most hosts to leave a bad review, so the "fair" guest segment that you really might not want rarely stands out.
Usually guests will volunteer why they are staying. I have not had issues with local folks either as we live in an area that rapidly goes from urban to rural and lots of people "down the road" want some peace and quiet. I think the fact that I limit my stays to a week or less really prevents a lot of shenanigans. And my cottage is truly not big enough or desirably located enough to be a party destination.
The fact is that no matter what, those who want to deceive will find a way to do it. If I had a home share I would probably be a lot more paranoid about accepting a stranger without an endorsement. TBH though, the fantastic guests I have had were not reviewed better than the so so or even bad guests I have had. So no review doesn't mean much.