Your listing seems clear to me. You can host 4 guests and the drop down menu in the "request to book box" goes no higher than 4. If a guest doesn't read the listing and is then forced to cancel, then it's their fault. As soon as the reservation has been accepted, it's a contract and like all contracts it's binding by the two parties. To make it clearer, you could add to your house rules : * For liability reasons, guests may not bring any visitors or any others to our home at any time, for any length of time. Only those individuals who are registered guests may enter the premises. Maximum number of guests 4, this includes children over the age of x" Then you ask for the names of all guests who will be staying and the ages of the children. House rules are very important to the security of your home, your family, neighbours and guests. If more than four arrive and you wish to accept them , you alter the reservation by adding a charge which has to be accepted by the guest. or you refuse entry to the property for the extra guests.Hope this helps. The title of this thread worries me." Cancellation by Host due to Guest mistake on number of guests arriving" I hope you never have to cancel. It has serious consequences for a host to cancel , a $100 fine, calendar blocked, exclusion from Super Host status, automatic notice on profile. Not Good. See here