Norma's place was extremely well-located, very close to downtown Mexico City. Shops, restaurants, and the historic city center are all located within a 15-20 minute walking distance of the apartment. I was able to get food delivered from Uber Eats and only got bad food poisoning once (be careful where you order from!).
The building is safe and very secure. I arrived on a weekend evening when everything on the street was shuttered and quiet. Note that the one-way street, on which the apartment is located, is extremely busy with cars on weekdays, making pickups and drop-offs challenging.
The guard will ask you to enter your Airbnb reservation confirmation number and the dates of your visit. Since I could not understand a word of what he was saying, much hilarity ensued, but we were able to sort it out using gestures. They asked me for my ID at the door and also took a picture of my passport.
The apartment is on the fourth floor, but there are stairs and two lifts (elevators). At the time of my visit, there were hand sanitizers installed in the lifts and also at the entrance to the apartment. The neighbours in the apartment across the hall appear to have young and very loud dogs. The apartment is right by the elevators, so there can be a lot of noise as people come and go at all times of day and night, especially on Friday and Saturday nights after midnight.
Norma's apartment was very clean and pretty spacious. The windows look out onto a narrow parking lot and the next door neighbours have direct view of the bedroom, so I kept the blind down. This also kept the direct sun out during the day, which would otherwise make the apartment very hot in June. The bathroom was well stocked with towels, soap (including bath soap and shampoo), and a hair dryer. I also found a fan in the bedroom closet, which was great at night, since it can otherwise get stuffy in the summer.
The kitchen is also decently stocked with pots and pans, coffee, salt, and cooking oil spray, though I bought my own oil for use. The microwave power cable does not reach the wall outlet above the kitchen counter, so you will need to lift the microwave out of its cabinet, which is located over head-level, and put it on the counter top for use. This I did not attempt to do, but instead heated my food on the stove. The water in Mexico City is notorious for being undrinkable due to microorganisms. For my first night, I boiled water from the tap for five minutes, and was able to get bottled water from a Super Isste around the block the next day. That store (and others nearby) did not, however, have any fresh produce, although they had supplies like milk, cereal, and bread.
The wifi is available throughout the house. I had some trouble with dropouts while streaming, especially in the bedroom, but was able to plug in an ethernet cable into the router under the television, which worked very well. I would strongly recommend bringing an ethernet cable (and any necessary adapters) with you if you need to use the internet for video calls or online streaming.
Norma herself is extremely responsive. I do not speak any Spanish, but we got by using the auto translate feature on the Airbnb website. For example I could not get the hot water to work on the first day. There were instructions on the refrigerator in Spanish, and if I had read them, I would have known what to do. It was all good once Norma told me by email to turn on the switch under the boiler in the closet across from the bathroom. Since the boiler makes a very loud clanking sound whenever a tap is opened in the apartment, it is easy to know that it is working. The water is also very hot, and I found it difficult to adjust the temperature (it was either freezing or scalding).
Norma is also very accommodating. As I was there for two weeks, at one point I requested a reading lamp in the bedroom and Norma promptly arranged for one within a few days. She also let me stay for an extra hour past checkout time while I was waiting for my afternoon flight out of Mexico City. I have not known any host who is more responsive and accommodating! I would recommend staying here.