My research partner and I stayed at Hernando's apartment in Roma Norte for two and a half months while we worked in Mexico City, and it was a fantastic base during our time there. The apartment is even nicer than the photos convey with its beautiful lighting and parquet floors. It is centrally located, and well equipped with all the necessities to truly feel at home. The neighborhood is very safe and the location is ideal--close to Parque Rio de Janeiro, great restaurants and cafes, and Ecobici stands. The rubber trees outside the apartment and the light streaming through them throughout the day also make the experience very special.
Hernando was a very thoughtful host and a great communicator. I highly recommend staying at this apartment if you are able, and thanks Hernando!