Addy, if you're looking for a romantic little restaurant in Paris (not that you have to look very hard), our longtime favorite is L'Auberge de la Reine Blanche on the Ile St.-Louis.
It had gotten a little chic-er the last time we were in Paris, but it hadn't lost its specialness.
And it's so nice to walk across the Seine to that cute little island...where, someday, I will have my pied a terre, n'est-ce pas?