The Marriott in Polanco has, without a doubt one of the best breakfast buffets anywhere. It is specially popular among locals on the weekends or special occasions, Mother's Day for example.
The lobby feels more like the living room of an elegante mansion with plus sofas, book lined shelves and the always and friendly concierge. There is a lobby bar which is great for an evening drink and a brief business or social meeting, sometimes there is a piano player and you can listen to jazz classics or Broadway hits.
With the rooms you have a choice of a view of Polanco or Chapultepec, the latter is definitely more attractive because you have a view of the park and a huge Mexican flag that flows on a field across the street from the hotel. Nevertheless, if you get a view of Polanco it will be very quiet even if you have a low level floor because all windows have double glass and are excellently insulated.