My wife and I stayed for New year's Eve in Villa Conchita at Coyoacan. We got a warm welcome from Minerva and her family. The room has all the amenities you need to have a good time in Mexico. It is clean and spacious. My mother-in-law got the chance to stayed here last year and she enjoyed it. That being said, it is mom-approved place.
The location is excellent, you have Frida Kahlo's museum in front of the inn and Coyoacan's historic center in walking distance. Miss Minerva is an excellent host and friend. I definitely recommend anyone visiting Mexico City to stay at any room of Heart of Coyoacan. This will be my place to stay for future trips.