We loved staying at Roberto's place. There's lots of natural light, and it feels very calm (even if you can hear people at the bars downstairs). The place is nicely decorated and thoughtfully appointed (including ear plugs, sleep masks, safe, and extra supplies). There are a lot of stairs (4 stories) and no A/C, but these didn't take away from the experience (especially because the fan in the apartment is powerful and there are two doors you can open to increase airflow). As a host, Roberto was responsive and attentive; I felt supported as a first-time (and 7-months-pregnant) traveler to Mexico City. Definitely recommend!