We had a really good stay in Condesa. As others have mentioned, Ernesto is a friendly host who gave us a warm welcome and helped us a lot by finding gluten free places to eat.
The house is well located for everything in Mexico City and large enough for a big travelling group. The kitchen is lacking a few things for cooking meals and the furnishings are showing their age (but you'll probably be eating out anyway). The beds are very comfortable and the linen was clean. The internet was fast and the washing machine got plenty of use and performed well.
Like the rest of Mexico City, it probably needs a reno, but it's got so much character you'll love it anyway.