My boyfriend and I stayed at Victor & Sergio's flat off of Cerdo de Hamburgo for a break between Christmas and New Years. We had a marvelous time. The location was great, very central to the city while also being in a nice, quiet street that felt very safe, secure and private.
Although we did have an issue with the hot water our first night. Victor & Sergio responded and acted very quickly, ensuring that our problem was resolved right away. They were very hospitable and communicate throughout the duration of our stay.
I would highly recommend this flat for your trip to CDMX!