Three friends and I stayed in Cristian's apartment while doing research in Mexico City for three weeks, and it was an excellent experience! The apartment is beautifully decorated, safe, clean, and spacious (i.e. the showers are basically entire rooms). The location is also perfect-- 2 minutes away from a main metro line, and the main hubbub of the centro is a short walk away. Also, the pedestrian streets around the apartment are all so pleasant!! A bar downstairs got a little noisy at night on weekends, but I imagine that would be the case mostly anywhere in the city. We had a wonderful stay, and highly recommend the apartment!