We really enjoyed our month long stay in the BuenaVista Neighborhood. It is not a touristy neighborhood and so we really got to experience the city as a local. I highly recommend the area just across the Reforma. There is a great market, bakery, and Machete (very delicious quesadilla this neighborhood is known for) restaurant. Split the chicharron and platano with a friend, because they are actually the size of machetes.
It is a little far from Roma and Condesa, where many of the hip restaurants are, but we rented bikes and it only took us 15-20mins to get there. I highly recommend renting bikes wherever you are in the city. It is the best way to experience CDMX. There are protected bike lanes everywhere and drivers are very friendly.
Some other highlights from the apartment were the comfy couch, the amazing blender, and big TV's in each room. The apartment is on the top floor and got a little warm because it was June, but we just opened the windows at night. Get yourself the plug-in mosquito repellent with blue tabs from the nearest big store though.