First of all, thanks to those who have recommended an extention cord!
On my last two trips, I decided to simply keep the "Do Not Disturb" sign on the door of the room - didn't want to risk contamination of equipment or anyone messing with the machine.
It's easy to find the housekeeping staff in the hallway to get clean towels or a new wastebasket liner.
And I can't believe how dirty the HEPA filter gets, and how perfum-y the machine smells once I get home, even when the hotel room was pretty neutral-smelling.
Shari