One of the reasons people choose a house over a hotel is that it’s more like “home”.
And one thing you can be certain of, is that there will be guests who drink, smoke, have religious or political views that you don’t agree with. If you try to prohibit this, you will be disappointed.
I know hosts who present a detailed list of house rules defining what a guest can and cannot do. Aside from the few common sensible rules, some can be absurdly self evident; “Do not stain the sheets and towels”. “Do not throw food at the TV”, “Do not throw empty liquor bottles into the pool”. Really? This happens a lot? What kind of people normally stay here?
Yes, like anywhere, we have a no smoking rule (one of the few rules we have) but if you think this will prevent people from smoking, prepare yourself for disappointment. So, our rule is “no smoking in the house”. If you smoke, please do it outside. There’s ash trays and everything you need to enjoy your cigarettes out there. Now they won’t stink up the house, and they won’t toss their cigarette butts on the ground. And most smokers don’t smoke indoors at home nowadays anyway, so nobody complains. Everybody happy.
With respect to this topic, one reason that guests choose a “home” over a hotel includes being able to invite some friends over for dinner and socializing. Many of our guests do this, and we welcome it. It’s one reason why they choose our place. It’s like home. And it’s presentable. It’s not embarrassing to invite your friends over.
However, 20 people isn’t “a few friends over for dinner”. That’s more like a “party”, and that’s expressly forbidden, for obvious reasons. But even then, what can you do about it? Are you going to call Airbnb and have them thrown out? Good luck with that. I smell a full refund for “invasion of privacy”, and of course the scathing retaliatory review complete with imaginary atrocities you committed on the guest.
The point is, I think it’s important to stand in the shoes of your guests before thrusting a list of rules on guests that lead to habitual conflict because they will inevitably be broken. If it doesn’t actually damage you in some way, is it really worth the conflict and consequences? Airbnb sure as hell won’t enforce your house rules, and could even severely penalise you for it.
Maybe your energies would be better spent striving to attract a better quality of guest in the first place.