Julio and María's place is great. It's located in the Chinese neighborhood and it's near everything. They light the chinese lamps at night so it looks pretty cool. You have several restaurants close by to go for a bite and metro stations super near. There's a 7-eleven that opens 24/7 in case you need anything. The studio is in an alley very safe and quiet so you don't get disturbed with street noise when resting. The alley is so nice looking that there was a commercial being filmed outside one night. The doorman was very friendly too.
The apartment is very cozy and has everything you need, and it has blackout panels so the light from outside won't bother you.
I didn't meet Julio but the communication was super fast and they let us in the apartment even before check-in time.
Definitely recommended; I would stay there if traveling to CDMX again.