My husband and I stayed at Juan Carlos apartment for a week.
The house is beautiful. This is a clean, nice, and, new apartment. We felt at home since day one. There is a wonderful roof deck (common space) full of plants where you can relax in the afternoon.
The apartment is very well located. From here you can walk several neighborhoods (Roma Norte, Condesa, Zona Rosa). In each of these areas there are many great restaurants and bars within walking distance of the apartment.
We felt completely safe day and night walking around.
Juan Carlos and his partner Thomas live in the house, and were always available to advise us on getting around the city and beyond. They helped us setting up taxis when needed.
We felt very welcome, and I wish to return to DF and to stay in that department again!