Highly recommended without reservation. Others have already said it all but Ivonne is a truly wonderful host, who will go out of her way to make you feel at home and really goes beyond any expectations. There's the delicious breakfast she prepares every morning, during which if you're new to the city she'll be able to give you plenty of tips for the day. She also very kindly invited me to join her for the independence day celebrations and the special meal he had prepared, which unfortunately I missed out on as I had made plans with my friends.
On practical matters its faultless, the location is great, a quiet street an easy walk to Coyoacan, everything spick and span, hot water always available, and the house has a bit more character than the usual apartment If you're into art you're in for an extra treat viewing Ivonne's work!
Go and stay with Ivonne and Gonzo, you won't regret it!