Elena was a fantastic host, quick to respond to any questions I had and she also provided great tips on restaurants/interesting sites in the city. My arrival and departure both went very smoothly. The apartment was just as advertised, spacious (2 beds/2bath), clean and within easy walking distance to all that Colonia Polanco has to offer as well as the DF subway system (Polanco and Auditorio stops). WiFi worked well, and the doorman (Eduardo) was also very friendly and helpful in giving advice. Would definitely stay at Elena's apartment again when visiting Mexico City.