Unbeatable location right next to Condessa's hopping café/restaurant scene but on a quiet street, we had no problem with outside noise. The room is lovely, and so is the shared space, especially the roof. The room is quite hot, there is a fan which helps somewhat but if you're really sensitive, take note. Maybe another fan would do the trick, a lot of places in Mexico city don't have AC.
Also, the room is close to the kitchen area so you may hear the other renters in the morning. There was no traffic at night though, it was perfectly peaceful. Overall great value, we would stay there again. And Alejandro is really nice, accommodating and quick to respond!