The place is stylish, large, and in great shape. Kitchen is stocked very well with plates, glasses, cookware, and tools. The location is fantastic--only four blocks from the Zócalo, with one of the DF's most popular street-taco shops just around the corner. If you want to splurge, one of the finest restaurants in the Centro Histórico is 2 blocks away. The 24/7 doormen are kind, helpful, and very responsive. I spoke with them in Spanish, but I think they communicate effectively in English, too. The elevator is old, but awesome and functional. ...And who doesn't want an elevator after schlepping luggage around all day.
For the Centro Histórico, it was rather quiet. My friends at the Gran Hotel had more trouble with noise than I did. That said, it IS the Centro Histórico, so expect some noise. I closed the bedroom windows and left the rest open, and I rested well. I didn't even use the ear plugs I brought. The room-darkening shades were a nice feature the morning after a night on the town.
I used über, taxis, and the Metro--all very convenient to the apartment.