Azul is really kind and friendly, and the location is fabulous (about a 12-minute walk to the bars/restaurants of Roma, a 20-minute walk to the edge of Alameda Central, and super close to the metro stop that goes to the Zocalo/ADO station).
However, I wouldn't recommend the room for 2 people (unless you intend to be out all day); it's tiny, and once we put our luggage on the ground, there was no room to do anything besides sit on the bed. Also not a good place if you have bad allergies like I have (there's a smoke smell that permeates the apartment) or are looking for more privacy, as Azul and friends were around a lot during the 2 days we were there (however, they're very nice and I probably could have joined them for a beer and chat in the living room if I wanted). It totally depends on what you're looking for during your stay.
One last tip: When you click on the "Get Directions" option from Airbnb, don't use the Google Maps option, use Apple Maps instead. The Google Maps one is incorrect and takes you about 3-4 blocks away.