Chechi's place is very spacious, clean and comfortable. Location is excellent, would totally recommend. Neighbourhood felt safe, a lot of bars and good restaurants in walking distance and very close to Roma Norte/Polanco. However, the place itself is poorly insulated from noise so if the neighbours are having a party or loud music, you can hear everything from one of the bedrooms so light sleepers might want to take that into account.
Communication, although slow in the beginning, ended up being fine and both Chechi and Anahi were responsive during our stay.
I would personally stay again, despite the noise issue.