We had a nice stay at Matias's place.
Pros: Amazing location, good value and Matias was very quick to respond. He brought us a few things the apartment was missing (a hair dryer, an extra fan and one more towel) right away when we asked for them. The apartment is right above a fantastic French bakery and within walking distance to a lot of great restaurants/bars/etc.
Cons: We visited in early May, and the apartment was quite hot as there is no AC. Even with two fans, it was sometimes hard to sleep at night because of the heat, as well as the very (VERY) loud street noise. The apartment also is in dire need of some updates, such as the toilet, which barely flushed. Finally, we found underwear from a previous guest in the bedroom drawers, which seemed very unsanitary.
All in all, this was a good value, but if we were to return to CDMX, we would probably pay a little more for a better AirBnB in the same neighborhood.