During our recent trip to Paris, we dined at Pizzeria Iovine's not far from the Louvre. It is authentic Italian pizza. It was really busy on the Wednesday we were there and a good thing we had reservations. The staff speaks English (on request), and the pizza was delicious. If you are looking for a break from steak frites and traditional French food, this could be your place!
Gusto Italia, 218 Rue de Grenelle in the 7th. It's just around the corner from Hotel de Londres Eiffel, where we stayed on the RS Best of Paris tour last year. Great pizza, risotto, pasta. We ate there twice, including pizza on our last night in Paris. On our first visit, we struck up a conversation with a young Parisian named Sebastian, who ended up buying us after-dinner drinks. This little place turned out to be a highlight of our trip. Did I mention the great pizza? ;-)