Our stay at Diana's apartment was absolutely lovely. Coyoacán is a gorgeous neighborhood with amazing restaurants, markets, museums, and parks. In fact we started each morning by going for a jog on the trails in both of the nearby parks. You could really spend a lot of time just exploring this area, but the apartment is also really close to the metro. (Additionally UBER is a great option in DF.)
The apartment itself is just very comfy and relaxing. It was really quiet. The kitchen was well-equipped. There is plenty of hot water. And the rooftop deck is a great place to start the day or wind down in the evening.
Diana is an extremely thoughtful host. We had everything we needed for a great stay.
As stated, the apartment is on the 5th floor, and you have to get there by stairs. If any member of your party has mobility issues, this would be unpleasant, but it's really not a bother otherwise. In fact, you'll probably be eating so much great food in DF that you'll want to get a bit of built in exercise!
Diana's apartment is a wonderful home base in Mexico City. I highly recommend it!