Mariel and her husband have a very cute private studio atop their home in Escandon, just south of Condesa. The bathroom is small and only separated from the bedroom by a curtain, but as long as you don't need much privacy, it does the trick.
The studio has its own entrance from the home below. It's a slightly precarious skinny spiral staircase climb up, but is very safe and you get used to it. The studio has its own private rooftop garden with nice views of Reforma, pretty plants and chairs for sitting.
Mariel was very kind and accommodating. I would recommend this to a young traveler or two looking for a cute spot in a good location.