This is a great little studio apartment in a well-maintained building with a roof-top deck. You couldn't ask for a better location -- Coyoacan's beautiful and quiet and the apartment's close to everything you'd need. There's a great bakery just around the corner where you can stop in for a pan dulce then go next door for an expresso. There's another, fancier bakery across the street from that, and a place that makes wood-fired pizzas, a laundry, and a corner store with the essentials. There are larger grocery stores a few blocks away, and the Metro stop is about a fifteen minute's walk.
Paty is a great host, and an interesting person to talk with. Ask her about China! She also took me to see a few places for rent, since I'm planning to stay in Cuidad de Mexico permanently. I'd highly recommend this place.