I just got back from my three night stay at Sandro's apartment and it was great! The aesthetic is simple, modern, and functional. There's a central garden space that added greenery to our stay and a small balcony to enjoy it. I wanted a place close to where our friends were staying and when I wrote to Sandro he sent me a map showing we were two blocks away. That was just the beginning of his (and his team's) helpfulness. We were welcomed with fruit and pastries and coffee for the morning.
The location in Condesa is excellent. The street is a privada and is just as it sounds, off the main street and quiet and also secure. Overall a terrific experience and I look forward to staying there again on my next visit to the city.