We spent a long weekend at Matilde's apartment. In my opinion the flat is better than showed in the pictures !
The location is perfect: very close to Polanco and the main street "Paseo de la Reforma", this area has a lot of attracions to visit (Museo Nacional de Antropologia is amazing !), good restaurants ( I'm vegetarian and I strong recommend " Pan Comido") and it has an high level of security.
If we'll come back to Ciudad de Mexico, this flat will be our first option