The Louvre area is a very special place. The Renaissance there is a very nice "Botique" property, that can be a little hard to find unless you know where you are going. If you are driving, give yourself much extra time, as going down a very narrow, one way street can be a little "Breathtaking. Here are some places that are easily walkable to enjoy.
First photo, In the Grand Hotel, next to The Opera, the Cafe de la Paix. A most interesting experience with great Oyster's and Vin, blanc or rouge.
#2, For one drink, Hemingway's at The Ritz, Place Vendome, a historical experience.
#3, An excellent small sidewalk cafe, Capucine, named after an order of Nun's.
$4, Les Maggot, on Rue St. Germaine, is another great, and historic, S-W Cafe.
#5, If you like "Pigs feet", this place is in Les Halles, and is world famous for that specialty Nest to it is a Summer "Street market"
Other posts have included other, very nice places, Bon Appetit".