My highlights

1. Du Pain et des Idées: I made it my mission to find the best pain au chocolat in Paris. That wasn't so easy. I never had a bad pain au chocolat in Paris, but none that really convinced me either. On the last day of my trip, however, I was pleasantly surprised! It was at the Boulangerie Du Pain et des Idées. The rest of the pastries looked really good, too!

2. Tapisserie - Charonne: Although not the best pain au chocolat, we still found some pretty tasty pastries at Patisserie Tapisserie - Charonne. Their chocolate cake is award-winning and tasted so different to any I've tried before. We only met Parisians there, so it's a real insider tip!

3. Kozy: I love breakfast! That's why I prefer to try out the cafés in a city, whereas restaurants aren't that important to me. Even in Paris! And my breakfast favorite was definitely Kozy. I was at the Montematre location, but there are other branches.

4. Au P'tit Grec: If you love galettes & crêpes, then P'tit Grec is the place for you. Two friends who studied in Paris recommended it to me. After eating there, I know why. But be careful: these are real calorie bombs!

5. Le Petit Lutetia: If you're looking for a good brasserie with real Parisian charm and good food, then Le Petit Lutetia is the place to go!

Cafés, Boulangeries & co

• Du Pain et des Idées, 34 Rue Yves Toudic, 75010 Paris (10. Arr.)
• Tapisserie - Charonne, 65 Rue de Charonne, 75011 Paris (11. Arr.)
• BUDDY BUDDY Nut Butter Coffee Shop, 15 Rue de Marseille, 75010 Paris (10. Arr.)
• Kozy, various locations (7., 9., & 18. Arr.)
• Acai & You, various locations (6., 9., 11. & 14. Arr.)
  
• AURA, 26 Rue Chapon, 75003 Paris (3. Arr.)
• Baguett's Café, 33 Rue de Richelieu, 75001 Paris (1. Arr.)
• Seraphine Boulangerie, 26 Rue de la Tour, 75116 Paris (16. Arr.)
• The French Bastards, various locations (2., 4., 7., 9., & 17. Arr.)
• Café Caractère, 2 Rue des Taillandiers, 75011 Paris (11. Arr.)
• Noir - Coffee Shop & Torréfateur, various locations (1., 4.,  7., 8., 9., 16., & 17. Arr. as well as Neuilly and Saint-Ouen)
• Les Deux Magots, 6 Pl. Saint-Germain des Prés, 75006 Paris (6. Arr.)
• Boulangerie Jacques, 209 Av. Charles de Gaulle, 92200 Neuilly-sur-Seine
• Aux Pains de la Ferme, 9 Rue Royale, 78000 Versailles
• JL Laprevotte, 24 Grande Rue, 77124 Chauconin-Neufmontiers (Disneyland)
• Amorino Eis, various locations (spread throughout the city)

Tasty Fast Food & Markets

• Au P'tit Grec, 68 Rue Mouffetard, 75005 Paris (5. Arr.)
• Crêperie des Arts, 27 Rue Saint-André des Arts (6. Arr.)
• L'as du Fallafel, 34 Rue des Rosiers, 75004 Paris (4. Arr.)
• JUNK, various locations (2., 8. & 15. Arr. and Neuilly)
• Atta, 24 Rue de la Tour, 75116 Paris (16. Arr.)
• Marché Couvert des Enfants Rouges, 39 Rue de Bretagne, 75003 Paris (3. Arr.)
• Marché Couvert Saint-Martin, 31/33 Rue du Château d'Eau, 75010 Paris (10. Arr.)
• Marché Couvert Saint-Quentin, 85 bis Bd de Magenta, 75010 Paris (10. Arr.)

Lunch & Dinner

• Le Petit Lutetia, 107 Rue de Sèvres, 75006 Paris (6. Arr.)
• Galette Café, 2 Rue de l'Université, 75007 Paris (6. Arr.)
• Le Paradis du Fruit, various locations (1., 6., 8., 9., 11., 12., 14. & 17. Arr.)
• Le Terminus Nation, 1 Cr de Vincennes, 75020 Paris (20. Arr.)
• Valma Brasserie Provençale, 45 Quai de Valmy, 75010 Paris (10. Arr.)
• La Favorita, 39 Rue d'Orsel, 75018 Paris (9. Arr.)

Bars

• Les Ombres Rooftop, 27 Quai Jacques Chirac, 75007 Paris (7. Arr.)
• The Printemps Rooftop Terrace, 64 Bd Haussmann, 75009 Paris (9. Arr.)
• ROOF Paris, 120 Rue Montmartre, 75002 Paris (2. Arr.)
• Terraza Mikuna - BHV Marais, 1 Rue des Archives, 75004 Paris (4. Arr.)
• Thirsty Mad Cat (Sportsbar), 120 Rue Montmartre, 75002 Paris (2. Arr.)

Bonus

I saved a few recommendations or came across some good places that I hadn't tested myself. But I don't want to withhold them from you. That's why I've added them to my Google Maps list. You can find all the places there.