First I must say the host Liliana was a wonderful. She always answered my queries immediately and went out of her way to try to please us. I visited Mexico City with my two young daughters (6 and 8) and she wrote a detailed list of children's activities in the city.
As for the apartment, it was a bit smaller than expected, but there are other features that made up for it. It was clean and seemed quite new, with ample closet space and drawers (which was nice for me since I stayed almost three weeks). It has a great location, less than a block from the wonderful City Market gourmet grocery store (I recommend both of the bar/ restaurants there as well as the gelato, also great selection of wines and craft beers) and walking distance from some of the nicest shopping malls in the city and the fashionable Polanco district, with great restaurants, museums, etc.
The apartment has very nice views of the Mexico City skyline and a very well kept gymnasium and swimming pool, as well as a children's play area. Also I felt very secure at all times as the building has 24 hour security and the common areas always have security staff.
I would recommend the apartment and would likely stay again if I return to Mexico City.