We drive, so I bring our mini Keurig. We always put a towel or washcloth under it so as not to scratch any furniture and always unplug it when finished. Prior to getting the Keurig we would bring a hot pot to make Starbucks instant VIA coffee. When we did that, the hot pot was always put away in the closet when we left the room.
I'm pretty fussy about my one cup of coffee and DH drinks multiple cups in the morning (and won't leave the room until he has had them), so if we tried to use what was provided in the room, there would never be enough sweetner or creamers, we would be tracking someone down daily to get more, so now we just bring our own.