@Elisabeth40 i am so sorry for what happened to you.
You actually can choose the guests that chose you by vetting them prior to accepting their booking. You do that by not accepting IB (these days it is best anyway not to, especially for Covid and quarantine related issues depending on where you are), and by asking them questions prior to accept the booking. I always wanted to give guests with No previous reviews the chance to have one and everybody, in the Airbnb style, should be allowed to be a first time guest. However, with those guests i go the extra mile and ask them questions and give them information as to what expect. I also make all my guests sign a contract where they give me their full names and addresses and accept the building bylaws. This has prevented me to having bad guests so far.
Example of my message to a guest with no reviews prior to accepting the booking:
"
Hello ....... and thanks for your interest in our condo for your visit to Toronto!
It looks like you have never before rented with Airbnb and we want to make sure that our place is right for you. Our house rules are pretty strict and we would like to make sure you have read them and that this accommodation suits your needs. We believe that everybody should get a chance to experience Airbnb and we hope you don’t mind us asking a few questions to make sure we are a good fit.
Could you please tell us more about your party? Who will be joining you on this trip and ages?
What is the purpose for your visit?
We strongly invite you read our house rules again as well as our Building Security Undertaking contract that each guest is required to fill, accept and sign to be granted access to the building.
We look forward to hearing back from you and thank you!
Cheers
Your Toronto Hosts"
Form here on you can have a pretty good idea of who might be coming and if to accept the reso or not.
As somebody else mentioned, also never accept bookings from locals, that is always a red flag, unless it is for a specific reason, like home relocation etc.
Last but not least, check your rates. Low prices always attract the wrong crowds 😊