If they figured out how to link their SONOS phone app to your speaker, they would not nee your account. I have a SONOS connect at home, and a SONOS play 1 at my condo. The SONOS app just picks up whatever system it sees. The link process is not difficult, but I suspect a renter woud not want to do that. leaving an iPod touch already linked would be easier if the renters did not take it when they left.