Celestin's place has a great location when going on foot as it is close to a lot of the tourist attractions, but it is even better when I was able to figure out how to use the Metrobus as the Durango station is literally across the street from his building.
In addition, Celestin as a host is awesome! Not only did he respond almost immediately to my messages, but also because his hospitality is impeccable. He told me that I can use the kitchen and even his coffee maker! Also, when I asked him for change so I can take the Metrobus, he just gave me the 2 pesos (which I paid back).
Although it wasn't a big deal for me, but might be for other people so I'm sharing it, is that before you get to his place, you do have to be able to take 3 or 4 sets of winding stairs. In addition, a minor inconvenience was that I had a hard time opening the apartment door with the keys. But these didn't dampen any part of my stay!
Overall, Celestin and his space is a good place to stay in when in CDMX for his hospitality and its location.