Hosts share their House Rules to set expectations with their guests, like limits on smoking, areas beyond the listing space that are off-limits, and permission to have visitors.
To add or edit House Rules after you’ve listed your space:
- Go to MANAGE LISTINGS on airbnb.com
- Click on the listing you want to edit
- Hover on the left side of the page to open the menu
- Under Hosting, click on Booking
- Under House Rules, enter your expectations and rules for guests
If a guest breaks a house rule, either before or during their stay, you can cancel their reservation without penalty.
House rules appear on your listing page, and guests must review and agree to them before requesting a reservation. They’re also sent directly to a guest once they’ve a confirmed reservation.
I think by "before their stay", they mean if the guest messages you before they arrive that they can not conform to your house rules you can cancel without penalty.