Huh... I thought there are usually clauses regarding "subletting" when signing a rental lease? At least where I am anyway, "subletting" is generally frowned on.
There are very good reasons for this. I did a background check on my tenant, not every possible person my tenant may randomly hand the keys over to, unsupervised. It's really not the same thing as having guests over.
That said, I'm not opposed to including some kind of pro-Airbnb language in my next lease. This is new territory so I don't know what it should be. A larger security deposit? A cut of the proceeds?