Fantastic location close to the Zocalo and eateries - perfect spot from which to explore the distrito federale. I wouldn't suggest booking more than 2 people however, as the couch is not very comfortable (the two i'm travelling with had the bed though and were perfectly comfortable).
A little annoying was that the flexible check in was voided by the apartment being booked for the night before - one of the main reasons we booked this apartment was our 6am arrival in mexico city.
Despite this, the place was nice and comfortable, and such a short walking distance from all of mexico city's attractions