Cesar's place was gorgeous. The apartment is very spacious with expansive views of the city. Both Cesar and Edith were very responsive (from before we even checked in until after we checked out), and both were quite pleasant. The place itself is in a great neighborhood with security on the ground floor. It's a little cold in the winter, but that's nothing a space heater can't cure (which Cesar supplied for all rooms). The place is on the 14th floor, but, if you are sensitive to noise from passing cars bring some earplugs - it was pretty faint to us, but we are from New York City and it might skew our perception of it.
If you're coming to Mexico City, definitely stay here. You'll be happy you did.