Colleen's home is the BEST place you could stay in Mexico City. Her home is located in Polanco, which is a safe and very nice area; also it's just couple of blocks away from Polanquito (with all the restaurants and terraces), Lomas de Chapultepec, supermarkets, and interesting landmarks.
Everything at Colleen's was great. Her flat was very clean, very quiet, but specially Colleen will always make you feel at home!
Colleen will recommend you many places to visit, and many things to do in the city. The apartment building is safe and quiet; with guards 24/7.
If I go back to Mexico City I will stay at her place for sure, I will also recommend it to friends!