@Peter671
Hi Peter, Airbnb works well because of 'trust'! Both hosts and guests have an expectation that they can trust each other to do the right thing.
But the platform also revolves around the review system! You are at liberty to either turn these guests away or insist that they declare the correct guest numbers and pay the appropriate amount for the additional guest.
Each approach is going to guarantee you of a poor review. We work so hard for what we get Peter, we need to do everything we can to protect it.
I, through the message stream so there is a record of it, would say to the guest who booked...." Even though you have booked for two people I am only to happy to accommodate the three of you and make your stay one you will remember for all the right reasons, but you have put me in a difficult situation here! The Airbnb protection scheme at present only recognises that there are two people staying in the property! If an issue arrises it is probably that neither you nor I will have the advantage of that protection scheme. Airbnb will write you off because you have not abided by the house rules, and I will penalised for going along with it! I am sure you will understand this. I want nothing more than to help you but l need you to amend your guest numbers so that we can each be sure that things will run smoothly"
Saying something like this will make them feel guilty! If you start threatening them or throwing water surcharges at them they will resent you, and when their review comes that resentment will be reflected in the review.
The art of being a good host Peter, is to be conciliatory, be a diplomat! It may mean you have to negotiate a slightly higher amount with the guest which you could them obtain through the resolution centre, but the reason we are in this business is to make money, and Peter, 50% of something is better than 100% of nothing! negotiate a settlement with these guests and then you can put that settlement to the resolution centre via this link.....
https://www.airbnb.com/resolutions or going to the ' Send or Request money' field at the head of the message stream with this guest.
I hope what I have said can help you get around this situation without too much damage Peter.
Cheers....Rob