I can't say enough great things about my stay at Margarita's apartment!
The apartment is beautiful, and receives warm sunlight every morning - the living room and workspace are beautifully lit each day. The office is a great place to work and focus.
Chapultepec park is a short walk away. I was able to run there every morning without any delay to my schedule. There's also lots of good food in the area, whether you're looking for sit down restaurants or food stands. Margarita will probably disapprove of my suggestion to eat regularly at Tacos de Guisado "Fish", but it was very authentic and cheap :D
Margarita lived in the apartment for many years and is an architect, and it shows in the little details around the apartment, from the books to the decorations and piano. It really felt like living locally. One thing to note is that you may hear neighbors walking upstairs in the morning. I wouldn't let this stop me from coming back at all, but would simply suggest ear plugs in case :)