I spent six very happy weeks at Maria's loft, and would recommend it without hesitation to anyone visiting Mexico City. The space itself is really lovely; it's full of plants, and thoughtfully and elegantly designed. Being there for six full weeks (and during the rainy season, no less) I spent a lot of time there, and I really enjoyed it.
The neighborhood is also a treat. It's a little quieter and more residential than nearby Condesa, so it feels more "real" somehow, while still being a very easy walk to everything. There're great little fondas and taquerias all over, as well a really nice upscale cafe/restaurant just around the corner. And there's an amazing covered market just up the block. It's also right next to the Bosque de Chapultepec, which is an immense and beautiful park, with running tracks, quiet places to read in the sun, and a number or world class museums.
Finally, Maria was a wonderful and attentive host. When I arrived, she had laid in supplies for me: coffee, beer, fruit, etc... And she was quick to respond and very helpful whenever I had questions or concerns (and when I broke a light fixture!)
I had a wonderful time at Maria's: it's a great space with a great host in a great neighborhood in a great city.