Two wellknown japanese cafeteria, close to the Louvre and the Palais Royal. Gyoza and Lamen served all day long. The one Rue St Anne is more traditionnal, chiefs are cooking in front of you. Often packed, in case there is a long waiting line, go to the one Rue St Honoré, you will eat the same!
I love to spend time in this museum, with great exhibitions about : fashion, graphic design, jewelry and toys. The bookshop is also really good. And basically... architecture !