The apartment was spotless and very welcoming, with historic character, and in a convenient location. I had some questions that Marina answered promptly. The key to the building is a little finicky, but I was always able to get in after a few tries.
I would recommend this place without reservation if the bed received an upgrade (the bed was two unpadded twin spring mattresses pushed together). I hope that is the case by the time I return to Mexico City, because it really is a wonderful apartment otherwise.