We had an amazing staying at Aida and Edwardo's place. It was clean, and safe, and located across the street from a beautiful park—not to mention only a few blocks from restaurants, coffee (good coffee) shops, Casa Azul (FYI - get tickets well in advance if you're interested in touring Frida Khalo's home), and the central square of Coyoacan.
Aida and Edwardo both spoke excellent English, and. were incredibly friendly and helpful throughout our stay.
Highly recommend.