@Stephanie-And-James0, I'm not sure I understand when you mention being paid after a guest's holiday.
AirBnB sends payment within 24 hours of a guest's arrival. (If you're using a venue other than PayPal, it might take 2-4 days.)
Make sure that the House Rules are comprehensive, firm, and clear will definitely help deter potential problem guests. People need to know precisely and in detail what the boundaries are with regard to the type of behaviour you will accept.
Likewise, be sure to have a hefty security deposit in place, along with an appropriate cleaning fee.
You could also install outside cameras - about which you would of course need to inform guests. The notion of cameras would also deter the type of guests who might try to show up with more people than had been indicated on the booking.
Perhaps - for a small fee - you could have someone local and trustworthy greet the guests when they arrive, and check the listing immediately afterwards to determine that everything had been left in order on the guests' departure.
As to contacting AirBnB, you can reach them via the Help link at bottom of this page.
Or via Facebook.
https://www.facebook.com/airbnb/?fref=ts
Or – if you have a Twitter account - try twitter@airbnbhelp. It’s said there’s a quick response.
More essential reading for hosts.
Contains a link with several international phone numbers (‘How to contact AirBnB’).
https://community.airbnb.com/t5/General-Hosting/Community-Help-Guides/m-p/23100#U23100
Regarding Contact numbers in the above link, I've twice recently had quick and effective responses via the Netherlands phone number. (Though oddly enough, the person to whom I spoke was actually in the US.)
The UK number.
+44 203 318