Wow, Marta's a super hostess with the mostess. She went well above and beyond what we'd expect from a host(ess) with her outstanding hospitality, warm welcome, and friendliness.
Their apartment is right next to the Chinese gate in Chinatown, which means you can walk to the zocalo in about ten minutes or so, Belles Artes in five, and a couple of metro stations too. A bonus is the views both from the apartment as well as the rooftop deck.
Muchas gracias a los dos, Marta y Manuel. Son super estrellas!