We had a great stay at the Kukun apartment. It felt safe and had a nice balcony, back patio, and rooftop. It was super spacious, decorated really nicely, and in a great area. The host was super responsive and on top of the communication. Before we could even ask a question, we had information on how to get in and when to check-in. When I'm in Mexico City again, I'd definitely consider staying there.
One thing to note, it's further into the residential area of Condesa. If you prefer to walk our your door and have bars, restaurants, and coffee shops right on the corner, then maybe consider something a few clocks over. The walk to get there were only 5 minutes, but it gets quiet at night.