@Lloyd107
House rules are merely guidance. They are for most practical purposes, unenforceable, except if you are willing to file a lawsuit, as they do (arguably) form an obligation under the contract. But guests generally don't know that they're largely unenforceable, so they can be (diplomatically) used as a carrot and a stick.
Unless guest damages are extraordinary (broken windows, completely destroyed furnishings, fires, etc) it is always unwise to confront the guest, since you have no guaranteed recourse, and are unlikely to receive adequate, or any compensation at all. Unless you've collected your own security deposit, which you can indeed do.
Considering this, why confront the guest, which is highly likely to result in a scathing review, which only adds insult to injury. In the worst case, a vindictive guest may file a (fabricated) complaint against you and receive a partial or full refund from Airbnb for all the imaginary horrors you've imposed on this guest, after they've caused damages to your place, and you had the audacity to to confront them.
So, you can choose: bad or worse. I'll take bad and chalk it up to the cost of doing business.
Now, having said that, the key here is prevention. Screen your guests before they book. If they seem "off", find a way to scare them away. The one thing Airbnb is good at is getting bookings. There's another one in the queue. Just be patient. It's Airbnb's greatest strength. Use it.
Good luck, and watch your back.
