@Tara659
The only way to discourage bad guests is to give them the reviews they deserve.
You don’t have to go into detail. You can say something positive but not exactly complimentary, such as “Guest observed some of the house rules,” or “Guest was slightly communicative regarding travel plans.”
If they did something well say that first.
If you give them 3 stars or less they cannot instant book so you and other hosts will have the opportunity to review their history before accepting them.
If you write a review you will be able to choose “would/would NOT host this guest again.” This information will be kept private and the guest will not know.
Good luck, and remember that the review process is there for the benefit of all hosts, including you.