I had a wonderful stay in Guillermo's house. He and his wife are truly among the kindest Airbnb hosts I've ever had. They were so gracious with their time and really cared about my experience in not only their home, but in CDMX in general. Their house is beautiful and my room was exactly what I needed. Keep in mind that although you have your own room and bathroom, there are other guests in other apartments in the house (and Guillermo and his wife), so some common areas are shared. The apartment is a small loft perfect for one person.
Some important things to note are that there is a spiral staircase to get to the floor where the apartment is located, and that in the apartment itself, there are some narrow stairs you need to climb to get to the bed itself. I didn't have any issues with the stairs, but you really do need to be careful and mindful while using them, and to use the handrail.