Here are The Traveling Professor's picks for 3 good restaurants in Paris:

Le Coupe Chou. 9-11, rue de Lanneau, 5th arrondissement.  Métro:  Maubert-Mutualite.
Americans seem to love this place located in the Latin Quarter, and for good reason.  The fireplace and candlelit setting make it a favorite for romantics.  The legendary Salade Coup Chou is topped with bacon, poached egg and croutons.  Boeuf Bourguignon is richly served with meaty beef, carrots and onions.  The sliced duck breast is my fave, perfectly balanced with sweet pears and light potato pancakes.  Are you hungry yet? Reservations are not usually required.  Website:  www.lecoupechou.com.

Bistrot d’Henri. 16, rue Princesse, 6th arrondissement. Métro: St Germain des-Prés or Saint-Sulpice.
Brothers David and Julien run this friendly spot with about 25 seats.  The menu has a strong Breton (Atlantic coast) influence.  That means dishes like duck breast with honey, lamb with prunes, and natural-tasting seafood crepes.  I never say “no” to anything with cheese, especially the potatoes. It should be about 30-35 euros per person.  Website:  www.lebistrotdhenri.1001menus.com.

Café Constant. 139, rue St. Dominique, 7th arrondissement.  Métro:  École  Militaire.  
A casual and relatively inexpensive spot near the ET.  Legendary Chef Christian Constant makes French food easy. Where else are you going to get dishes like tartare of oysters, seabass and salmon seasoned with ginger and lemon created by a Michelin-starred chef?  Or how about veal cutlet from the Basque country with white Tarbais beans?   I always have room for the dreamy Île Flotante for dessert. One of my top picks.   About €100 for two.  Website:  www.cafeconstant.com.