Thank you, Daleth! Very caring of you!
Yes, I don't leave my son with strangers, and at this point in my life would only invite as roommate someone I had gotten to know first. I leave my kid (9) only with established friends and family members that I expressly trust. (His disabilities leave him even more vulnerable than other kids are.) So, he would never be alone in a house with an airbnb guest, regardless of the guest's gender or even a background check (because those only provide info on a fraction of abusers, i.e. those convicted, and provide no info on how aware a person is about general kid safety stuff).
I am also too scaredycat to even have a stranger with just me! So, my airbnb idea is that I would only book a guest on nights my male friend could stay, too. This would serve well in many ways: my friend likes to stay with us regularly, and wants a place to stay in the region we're moving to; my friend is already an airbnb host and loves doing it and is a "host with the most", just loving to meet strangers, help them with whatever they need, cook and host a great meal, etc. So, I wouldn't host alone. I would only host in partnership with my large, friendly, intuitive, gregarious, male friend :)