Niña was the absolute sweetest host! She was very responsive any time I messaged her about something, and she checked in on me often. I was very thankful to have her as a host and friend during my time in Mexico City.
The location of the apartment was good - there is an Oxxo and bank within a block or two, a market a few days a week right outside of the building, and many, many food carts/restaurants/cafes/etc. within a couple of blocks. I loved just walking up and down the neighborhood streets and finding new restaurants and such to check out.
The apartment itself is very cozy and was great for one person. The bed is also VERY comfortable, as many people have said. And there is also plenty of hot water. I worked from home a lot of the time and the wifi was great, no complaints there. The apartment is further back in the building from busy Avenida Álvaro Obregón, so you did not get any street noise, but you did get some noise from the other apartments because windows face the interior of the building. Because of that, I tended to sleep with ear plugs in or white noise playing on my phone.