There is a seafood restaurant downtown called āLos Arcosā, which mostly only locals frequent. One of the best meals Iāve had in my life. They will make you off menu items (like Tequilla shrimp or langoustines and flambayed fish).
Polanco is also a beautiful area, which they call the āBeverly Hillsā of Mexico City. One of the best rated restaurants in the world is there and itās called āPujolā, but good luck getting in without a rsservation (we didš).
Such a great city, enjoy man!