Francisco's house was as lovely, and he was a delightful host. He was very friendly and provided good advice on places to see. Hola da, the housekeeper, was wonderful and really friendly. The breakfasts she prepared kept you going until the evening. The location of the house is perfect to get to most places that I wanted to visit, and I felt very safe.
I'd definitely recommend staying at Francisco's if you visit Mexico City for 3 or more days, and don't want to stay smack bang in the Historic Centre where it's a lot busier.