To echo others' comments, we also had a great experience staying at Sandro's apartment. He was an excellent host and made sure that we were comfortable with the apartment and the surrounding area. On that note, the apartment is very convenient to area restaurants, nightlife, etc., and if you need to take a taxi there is a sitio right across the street that always had cabs available. Moreover, Sandro left a local cell phone, allowing us to make reservations, call taxis (as well as get in touch with him if needed.) The pictures of the space itself are accurate - it is an airy, well-thought out studio apartment, perfect for one or two people. It had been about 10 years since I had been in Mexico City and much has changed - for the better! I highly recommend a visit and a stay at Sandro's place in Condesa.