Mario welcomed my wife and me graciously, showed us all around his spacious apartment, and even explained where to find a hidden key in case we forgot the one he gave us. Mario stayed in the apartment while we were there, but since he was practically invisible as well as inaudible, I didn't mind, and very much enjoyed our comfortable bedroom along with the large kitchen and bathroom. (We never had to wait for Mario to use the bathroom, and never even heard him using it.) On the other hand, my wife didn't like the idea of sharing our quarters with anyone, no matter how gracious and unobtrusive--as Mario was. He told me, in fact, that some people who had booked the apartment in the past decided not to take it when they realized (belatedly) that they would be sharing it with them. But if you don't mind a secret sharer (thanks, Mr. Conrad), Mario makes a great host.