Alex's place is nice and centrally located. It's close to all, especially to the Paseo de la Reforma and Roma areas. A great plus to its location is that it is a 5-minute walk to Sumesa, a grocery store on Londres street. We went there a few times. The building is very secure and the guards were extremely helpful to us. The hosts were very responsive and always answered all our questions promptly; and the checkin process was very convenient. We were a large group of 10, and the upstairs patio was a convenient place to gather. The best rooms were the ones with en-suite bathrooms, but having 3 bathrooms in the whole unit helped greatly for a group as large as ours. The kitchen was well-stocked with pots, pans, utensils and spices. Overall, our stay went well.
Some minor cons for a large group: Because there were 10 of us, the living room and dining rooms were a bit crowded at certain times. And the bunk beds and trundle beds may not work for people that prefer traditional beds.