@Shelley29, I strongly recommend that - as a new host - you read carefully through the links in this URL in order to become familiar with how AirBnB works.
Essential reading for hosts.
Also contains a link with several international phone numbers (‘Contact AirBnB’).
https://community.airbnb.com/t5/General-Hosting/Community-Help-Guides/m-p/23100#U23100
Make sure as well that you have a clear and firm set of House Rules placed in the room. This will help avoid any misunderstanding about what behaviour is expected from the guest and what is offered by you as host.
I note that your current House Rules are fairly minimal. You might want to beef them up for the next guest.
I'd also suggest you not use Instant Book until you have a few hosting experiences behind you. It's important to have a clear idea about what sort of person is asking to be accommodated, especially if it's for a long term.