We will be travelling from our hotel in the 15th to Gare du Nord to catch the TGV to Reims. Bir-Hakeim is the nearest metro to our hotel. What would be the easiest route to Gare du Nord? We will not have luggage with us - this will be a day trip - and we haven't got tickets yet, but will probably be aiming for an early-ish time (to make the most of the day in Reims).
Any suggestions greatly appreciated!