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Best tranport method: Depends on how much luggage you have. If you don't have much, fastest would probably be the RER (parisian high-speed subway). You can find a map here: http://www.paris.org/Metro/gifs/rer01.map.jpg. The airport is at the beginning of the blue line (B3) and you would have to change at St-Michel Notre-Dame unto the yellow line (C) to the station Champ de Mars-Tour Eiffel. Whole thing takes about an hour.
There also are shuttle busses, but I don't think they go to the Eiffel Tower. Else there is always the taxi option.