If you are looking for a non-French menu type meal, I can personally recommend a Chinese restaurant (even has a take-out option) that is on rue de la Buffa, around the corner from rue de Rivoli. You will see a lot of Asian diners eating here, as the food is authentic, delicious, and good value. The owner and his wife are very welcoming, friendly, and provide excellent service.
I always order from the the 18€ menu (choice of starter/main course/dessert): nems or spring rolls, shrimp with basil with fried rice, ice cream; however, they have a large selection on their menu to choose from. You may even see a cute ‘diner’ at a nearby table!
(This is a NON-paid personal recommendation)