@Helen3- That sounds like an interesting feature with the vetting questions. I looked on the IB settings and didn't see a way to do it. Can you provide instructions on how to add those questions?
As for off limits areas, the back of my house, location of the dining room and living room-office, are off limits but there are no doors separating them, just open archways. It is spelled out very clearly in house rules, as well as welcome message sent to guests, that this area is where I typically work and live at night, and is off limits. I would say 15% of all guests I have ever had have wandered into this area. Only two were serious problems. A man from China who looked through my mail in my office and then a large family, renting both rooms, who completely disregarded house rules and used both the living room and dining room, and wouldn't leave even after being told this was off limits. That same group, by the way, also tried to force open the door the basement (also off limits) as they were looking for a washer and dryer, which my house summary clearly says I do not offer for guests.
I will never forget that group. The day they left they asked for my off-AirBNB contact info as well as money to invest in a get-rich-quick scheme. They don't appear to have been active anywhere else on AirBNB after my place, but here is their profile so others may beware.
https://www.airbnb.com/users/show/104058536