Unexpected visit

Hmm good question. I've never had anyone do that to me before but if it was family then no problem, they can stay as long as they want (if they don't mind sleeping on a mattress on the floor LOL) I would tell them though that it would of been nice if they called before they came. If it was a friend or someone I sorta knew, but wasn't sure about them, then maybe not - but that would also depend on how desperate they were for accommodation. I would probably let them stay for a night but they are on their own after that.