Yes, of course. But the coffee maker is easy. I wouldn't go around unplugging a host's stuff, @Susan1404 , for fear of doing damage. I was jolted awake at intervals all night long once by a small fridge in a listing. I did not unplug it. Cursed it, which is maybe worse?
I wouldn't unplug an entertainment system, or a microwave, unless I found it unplugged upon arrival. But if I were to use a coffee maker, anything less than one of those intimidating steams-the-milk-and-all things, I would probably unplug it afterward as a cost-saving reflex.
You might want to decline any request to book from me. 🙂