I know quite a lot of restaurants in the center of Paris (had my office for 8 years not far from Opera/Le Louvre), so I'll throw in a couple addresses I like :
Good bread and "petits pains" :
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Du pain et des idées (34 Rue Yves Toudic, next to Republique). This is a no contest. Just go there and buy one of everything. Try the "brioche" (Mouna), might not look like it, but it's to die for (and eat it fresh ! ).
"Brasserie" : Not a kind of restaurant I personally go to very often, but this kind of restaurants is very Parisian, and you should try one if you are visiting. Two references come to mind :
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Le Grand Colbert (2 Rue Vivienne, next to the "Jardins du Palais Royal / not far from Opera/Louvre)
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Brasserie Galopin (40 Rue Notre Dame des Victoires , right next to Bourse)
Mind you those two are more on the "upper class" side of things, most people eating there wear suits (it's not mandatory at all, just related to the location), but those are the kind of restaurants you'd see in a movie if they needed to show a Parisian restaurant.
Another, which is really very typical, but not classy (at all) (in fact, doesn't look like shit ; has more kind of a working class feel to it). But if you want to try typical every day, (good) french food, I'd recommend you try this one :
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Le Bougainville (5 Rue de la Banque). The place is always packed for lunch, and there is a reason for that.
Good meat (beef) :
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Santa Carne (24 Rue des Tournelles , right next to Place de la Bastille). Charcoal grilled argentinian beef. Good stuff.
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The Beef Club (58 Rue Jean-Jacques Rousseau , that's close to the Louvre). Kind of a hipster/bobo place. But who cares, their beef is good, and their mac&cheese side is god damn delicious. Ask for the "stilton sauce" ; holy fuck ! Book ahead (open only in the evening). Also if you go there a friday or sat night, they have a speakeasy (downstairs).
Italian ?
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Daroco (6 Rue Vivienne , next to the "Jardins du Palais Royal / not far from Opera/Louvre). Located in the former Jean-Paul Gautier workshop (place looks great). Book ahead to be sure.
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Pizzeria Popolare (111 Rue Réaumur, next to Bourse) New and overcrowded, upper level is quite noisy (ask to go downstairs), can't book ahead, but I love their truffle pasta. Their pizzas are not half bad either !
Talking about Pizzas ! Excellent ones can be found here :
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Iovine's (7Bis Rue du Colonel Driant, close to the Louvre as well) This is my personal fav for pizzas in Paris (but they only serve Pizzas, nothing else). Their dough, tomato sauce, and mozarella are top notch.
Bit more classy :
Le Restaurant du Palais Royal (inside the Jardins du Palais Royal). Just got their first Michelin star. Well deserved, but sadly as expected, they raised their prices. Still worth it. (this one you might get away with wearing a hoodie if they see that you are American and that you are eating on the terrace in summer, but inside you'll look very out of place)
Kei (5 Rue Coq Héron) Fine stuff. Kind of the same things that I just said for Le Restaurant du Palais Royal apply here.
Passage 53. (53 passage des Panoramas, next to Bourse). Two star Michelin. Japanese Chef cooking his vision of french cuisine. Was my fav restaurant for several years
Japanese. Someone mentioned the Japanese restaurants located rue St Anne. I am not a big fan of those. Here are much better ones :
-Lengue (31 Rue de la Parcheminerie
). They serve what they describe as a Bento for lunch (a fine and delicious one) and becomes an Izakaia at night. I love it. Great collection of Japanese alcohols (some amazing whiskies), the chef is a fine wine connoisseur.
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Momoka (5 Rue Jean-Baptiste Pigalle). Good stuff as well
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Isse Izakaya (45 Rue de Richelieu) : their bento is very good as well.
Now for more specific stuff, but that are kind of street food oriented
Want Gyoza : go to
Gyoza Bar (passage des Panoramas);
Ramen ? Go to
Kotteri Ramen Naritake (be ready to wait in line outside)
Udon ?
Udon bistro Kunitoraya (1 Rue Villedo)
Kare ? (Japanese Curry) : Ok I don't know any exceptional ones, I just take one at
Taisho Ken 3 or
Sapporo, they are ok, but nothing crazy.
Korean ?
Jan Chi (6 Rue Thérèse)
Burgers : You can find some perfectly good burgers in Paris now. They are not gigantic, but they are tasty and made with quality ingredients :
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PNY (Paris New York) : 1 Rue Perrée (next to Republique, they have two other locations, but this one is my fav). Try the "Smoky Blue" (with extra bacon for good measure

) and ask for "loaded fries".
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Roomies . (14 Rue du Cygne ; Next to Chatelet - Les Halles) Here you tell them what you want in your burger. Good meat, crunchy fries.
Wine Bar. Want to sample some excellent wines ? You are so very right !
-Try "
Legrand filles et fils" (located in the "Galerie Vivienne" , close to the Louvre/Palais Royal). It can be very expensive (they do have some very affordable stuff though), but the place is beautiful, and they do have some top of the line wines that you will not find anywhere else (think Petrus, La Tâche, Haut-Brion, Yquem and so on). They also have a delicatessen shop, just go look.
Coffee (and by coffee I mean espresso) :
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Telescope (5 Rue Villedo). If you like good coffee, this is the place to go. I go there almost every other day. The owner knows his shit. (fyi : they have a "no laptop" policy, never really understood why. Just don't go expecting to be able to work from there)
You could also try
L'Arbre a Cafe (next to Sentier).
Feel like eating huge amounts of meat and seafood ? (I'm talking about 1kg of beef tenderloin on skewers)
-Pedra Alta (11 Boulevard Beaumarchais, there are several in Paris. In fact it's a Portuguese restaurant. They have pretty good meat imho)
There ! Hope this helps. And if you are looking for something else or more specific, just ask.
They are not Romanians (inhabitants of Romania), but Romani people ("roms" , aka Gypsies )