Our family stayed at Claudio & Angela's place for a week during COVID in mid 2020. Although almost everything in the area was closed due to the pandemic, the location was very nice and the apartment was spacious and clean. Angela was very accommodating and responsive!
The security in the building is very nice, with guards at every entrance 24/7, but note that this can make check out a little difficult if you're leaving very late or very early because you have to leave the keys in the apartment, but must swipe out to exit the building. Thus, you either need to "tailgate" someone leaving the building or make friends with the guards so they let you out (which is easier said than done).
Also note that the apartment complex is very much in the downtown area, which means it can be quite loud at all hours. You will most likely want to have your windows open as there is no A/C, but even if they're closed they are not particularly well insulated against the sounds of the city. We got used to things like loud crosswalk signals all night in the first few days, but if that sort of thing bothers you consider bringing ear plugs.
We hope to visit Mexico City (and the amazing taqueria "El Rincon" across the street from the apartment) again under better circumstances, and absolutely can recommend Claudio & Angela's place to anyone who wants to be in the thick of the Mexico City experience!
Muchas Gracias!