The apt is ideally located in the lovely Roma Norte neighborhood. It is in a lovely old building in a perfect location on a quiet and safe street one block from Fuente de Cibeles. It is on the main floor and looks directly onto the street. The location offers easy access to the Metro and Metrobus, the Zona Rosa, parks and endless restaurants, bars and shopping. There is a good Sumesa supermercado a few blocks away at Av Oaxaca & Alvaro Obregon.
English-language instructions for self-checkin were a bit unclear - rather than instructing to "press" the smart-lock screen, it should state to press with your palm (covering the screen) to activate the check-in screen - tapping, finger presses, swiping etc will not work.
The apt itself is in a beautiful old building, with period architectural details. It is adequately but simply furnished. The bed is comfortable and the room quiet. The water is reliably hot, the bathroom modern and good WiFi available throughout. There is a NetFlix subscription but no conventional cable TV. There is a safe-deposit box. There is no AC, but a fan and heater were provided.
The kitchen is adequate for basic cooking. There are few pots and pans and limited utensils and the sink is a bit awkward - recessed about 45 cm below the counter top. There is a good 4-burner gas cooktop, but no oven or dishwasher.
The apartment was very clean and cleaning can be arranged for longer stays. No cleaning supplies (or even a broom or mop) were available.
The host Carlos speaks excellent English. He was always helpful and congenial and communication was excellent. He kindly provided a toaster on request.
Overall, this is an excellent and recommended home-base for your visit to CDMX.