@Mark437 Yes, you can ask the guest for verified ID, but I think it's supposed to state that in your ad if you don't use IB. But ask anyway and maybe he'll easily comply.
I've had a few guests who had scanty info and had been Airbnb members for years with no reviews. The way I get comfortable with potential guests is to message with them- I find I can tell a lot about someone from how they communicate. (I also don't use IB) There were valid reasons they had no reviews- one said she'd joined but never actually booked- just "armchair traveled". The other two said they'd stayed a couple places but the hosts hadn't left any review. In all cases they turned out to be not just okay, but wonderful guests.
But I only host 1 guest at a time in a single room. With a place that accomodates 12, I'd be cautious-just ask some questions and see how you feel with the responses.
I worded it "So I'm just curious- I see you joined Airbnb back in 2016, but you don't have any reviews- did you never end up booking before this, or is there some other reason?"