Drinks at Hotel Costes are definitely recommended!!! If you can find a reservation at the restaurant, good for you, otherwise just go for drinks at the bar, and Do order the Foie Gras on toast with your cocktails!!!! You will thank me for sure.
Another lovely place to dine is Monsieur Bleu. The view of the Eiffel Tower while you are drinking a glass of tantalizing French wine, and finishing off your dinner with a Pavlova for dessert, is simply something to remember. And you can always enjoy an art show at the Palais de Tokyo before that.
A coffe, hot chocolate, or even a full fletched meal (Their potato puree is the best ever) at Cafe Marly is highly recommended. Located in the Louvre, it's a great place to be, and the surrounding is simply overwhelming.