My wife and I stayed here over Dia de Muertos and loved it. The location was fantastic with tons of cafes and restaurants on a pedestrian-only street right outside the door. There is noise with those cafes and restaurants playing music late into the night, but we didn't have any trouble falling asleep due to all the walking we did during our stay. The apartment itself is very nice and better than we expected - we have stayed at many other places in CDMX and this was easily the nicest. The apartment is clean, the bed is soft, the bathrooms and kitchen are excellent and modern, and we felt very secure with multiple locked doors. Clean drinking water is provided, and it was nice not having to go find giant jugs of water to carry back.
Martha is an excellent host and gave us recommendations for restaurants and things to do in the area. We only had one issue, but we can't really complain about it since it was taken care of easily - the water heater went out one night, and Martha got a plumber to come the next morning. She is very responsive and will take care of any issues you might have.
10/10, would stay here again.