We loved Ana & Javier's place! It's centrally located within Mexico City and surrounded by great restaurants, bars, etc. Ana was also super responsive to our messages and allowed us to check out later than 12PM, so we could make the most of our last few hours in the city before departing.
The apartment itself is also really quite and clean. My only concern is that the hallway light on the first floor was out when I was there, making the stairway quite dark after 7PM. It can also get a little loud since Condesa a popular neighborhood for going out. Put those earplugs to good use and you should be ok though!