Salvador's apartment was wonderful! I was at a conference at CNA (CENART) which is a 6 minute walk away. The Ermita Metro is only 2 minutes away, and the neighborhood felt safe, middle class. I should say that I'm a woman traveling alone.
The apartment is comfortable, and well-designed. There's a lovely kitchen, so I was able to prepare food easily. I went shopping at Walmart, which is a 25 minute walk. I got an Uber back, with my shopping. Most Ubers locally cost $2 or 3, so you can use Uber safely to get anywhere. I also used the Metro in the daytime to get to the amazing Anthropology Museum (don't miss it). I also walked 30 minutes into Coyoacan and bought traditional gifts in the market. The center of Coyoacan has lovely bars and restaurants.
There is an Oxxo bodega across the street for buying milk, beer and snacks, and a Sanborns store a block away with a decent restaurant.
The shower was modern and the water pressure was good. The apartment was pretty quiet (for Mexico City). You can hear a little street traffic, but nothing major. The apartment is on the top floor, so there are no footsteps above you, which is good. The roof above is a private roof garden just for the apartment, so you can get a great view of the city up there.
Salvador was a great host. He gave me his Metro card, he drew maps and suggested places to visit, and he responded quickly when I messaged him.
If you want to be near CENART, this is a great choice. If you want to be near the museums and nightlife, this isn't for you, but you can easily get to the center of town (Roma and La Condesa are about 20 minutes away).
Thanks so much Salvador!