Mario's place is lovely and so is he! The room was very private with good sound insulation and a window overlooking the cafe-lined street with huge green trees. The doors involved all use locks that work well without having to jiggle or fiddle with them at all. There was enough hot water and pressure to have a nice shower (an amenity in MEX). Mario knows the area very well and had great recommendations for restaurants & bars. His place is the best value for the money I've found in a shared space in Mexico City.