My wife and I stayed for a long weekend, our first trip to CDMX. The apartment was great and exactly as it appeared in photos and description. It was only the two of us, but the apartment has more than enough room for four to be comfortable.
The neighborhood is beautiful, safe and lively. There seems to be an endless variety of restaurants and shops within a short walk (don't miss La Capital restaurant right across the street).
The apartment is situated in a lively district, and it can be a bit loud at night. (Our first night, one of the neighbors behind us partied, loudly, until about 4am). The water heater only has the capacity for one brief shower at a time, but it recharges quickly and wasn't a problem for us.
We hope to return to Mexico City soon, and we won't hesitate to stay here again.