Awesome location, Coyoacán is a beautiful and very safe neighborhood. I really liked being on the roof, laying out in a hammock in the evenings. Teresa and Claudia were super nice to me - one afternoon, after returning from a little walk, they were eating a home cooked lunch on the patio and invited me to join them. They gave me a taco, chicharrónes, and some tequila, haha, and we talked about the political history of México, very interesting. It could have been nice to have a mini fridge in the room, but I was able to use theirs, so it was fine. (Oh, and there isn’t air conditioning, but the weather was perfect and I grew up without air conditioning so that kind of stuff has never bothered me. But if you’re picky and spoiled, just be aware). For only $20/night, I don’t think you can do much better. If I go back to México city anytime soon, I’m definitely knocking on Teresa’s door, just to say hey.