What a charming place! Nancy is friendly host, curious and well behaved. She gave me a metro card to use which is a nice touch in huge Mexico city. Bed is comfortable, shower warm, whole place is clean. Relatively easy to find but you have to do a few minuts walk to nearest metro station.
Just a tip for a light sleepers: during weekend you can hear quite loud music from neighborhood. Bring earplugs. Otherwise highly recommended.