A few more pointers to what is already a good list:
Uber: if you don't use Uber already, it is outstanding in Mexico City.
Sunday biking on Reforma: Every Sunday morning to mid-afternoon, Paseo de la Reforma downtown is reserved for bicycles and other non-motorized transport. It is very popular with local cyclists and skaters, and a lot of fun. Bicycling in Mexico City has come a long way in the past ten years. Today there are reserved bike lanes on many arterial roads, as well as the Ecobici rideshare program. (Unfortunately, Ecobici is inconvenient for visitors, as you need a Mexican credit card and local address to sign up for the program.)
Airbnb in Mexico City: I've had very good experiences with Airbnb here. There are outstanding deals particularly in Condesa (great Art Deco architecture) and Roma.