@Yiwei3 Yes, there's apparently all kinds of blogs and such where people tell each other how to scam a free Airbnb stay, what sort of nonsense to tell a host to hide the fact that you're intending to throw a rager party, etc. Makes things hard for hosts. And if guests get bad reviews, I hear they often just delete their profile and set up a fresh new one. Not sure how they do that if they have to submit govt. ID, but I know it happens.
One reason I suggested setting a 3 day advance notice is that it buys you time to dialogue with guests to try to get a sense of what what they are telling you is true- if you get some spidey sense that they're not being honest, you then have time to contact Airbnb to cancel the reservation based on feeling some red flags and being uncomfortable, or impressing on the guests that you keep a close eye on things and won't tolerate extra guests, etc. But even experienced hosts have been caught out by clever guests lying about their intentions.
Advance notice and not accepting one-nighters doesn't work for a lot of hosts whose bread and butter is last minute bookings because they live near an airport or something (delayed or postponed flights, etc), but if you don't think it would hurt your business, it's a good idea. Better to have a few less bookings and no issues than a full calendar and a bunch of headaches, IMO.