Don't ever be tempted to rent your place out for 30 days or more, because legally they become a tenant in California. If they refuse to leave, then you have to spend a few thousand dollars to hire a lawyer, go to court, and then it takes about 3 weeks minimum to kick them out. That's during "normal" circumstances. Under this coronavirus thing, there is NO legal recourse in kicking out a tenant who refuses to pay rent. They can continue to stay rent free indefinitely.
No way I would rent to any tenant without doing a background check. Renting to a legal transient occupant (less than 30 days) is different. If they overstay, you call the sheriff and they'll kick them out.
Personally I don't allow stays of more than 7 days because I don't want to be stuck with undesirable guests for a longer period of time. I have no problem booking guests when I'm open for business, so 7 days works for me.