Chechi's place is a wonderful, clean and modern space extremely conveniently located in Hippodromo/Condesa. We never felt unsafe. It was relatively easy to find for taxis (although keep note that the address is 3 numbers, the last number is an apartment). 5-10 minutes walk from excellent coffee, great food, fruit stands, a running path, the park, metro et cetera. The building was extremely secure and Chechi arranged for several persons on call should we ever need.
Things to note, this is a walk-up to the third floor. Not a huge deal, but you'll feel it with the altitude and probably not ideal for anyone with injuries or limited mobility. Secondly, the windows have no screens. Let Chechi know when you'll be arriving and she can make arrangements to be met to transfer the keys.
Across the street from a Bikram Yoga studio! A few numbers down from a dessert place. Would recommend to others!