Paris Suggestions

We are going next week and are also staying in the 6th. for part of the time. The best meal I have ever had in my life was at Guy Savoy which recently moved to a new location in the 6th. It is a Michelin 3 star and is super expensive at night, but they have lunch specials. You have to request the lunch special when you make your reservation. My other favorite upscale restaurant in the 6th is Allard. Fish La Boissonnerie is a more casual bistro on rue de Seine. Since you are going solo you may want to check out L'Avant Comptoir near the Odedon. It is a casual stand up wine bar with very good food. If the weather is nice, get a take out order there and eat it in the nearby Luxumbourg Gardens. For dessert get pastries or macarons from Pierre Herme on Place St. Sulpice. Les Papeilles is a small casual place near the Lux. Gardens. Le Deux Magots is an atmospheric sidewalk cafes for drinks and people watching, as is La Pallette. I could go on and on and the 6th is far from my favorite neighborhood for restaurants. My two favorite restaurant rows in Paris are rue St. Dominique and the area around the Palais Royal.

It’s been almost a decade since I’ve been in Paris, so my recs are stale (however look into the Bisteonomy movement). I would also recommend you take a look if you are instagram enabled at a feed called Paris Is My Kitchen. She highlights great up and coming spots and well established gems and she also organizes food tours.

The 6th has some decent eating spots, esp if you're solo.
--L'avant Comptoir, as mentioned, or L'avant Comptoir de Mer (next door), or the L'avant Comptoir de la Marche (a couple blocks away)....all are tapas-style small plates suitable for grazing. The Marche one has seats, the other two are more stand-up.
--Le Comptoir de Relais, also by Yves Camdeborde, is a cafe (and the source of the joke name of the tapas bar next door, "After the Comptoir". It has a bunch of sidewalk tables, a few tables inside, and a basic but delicious menu. I had a killer pork terrine there in late '17...they brought me the whole crockery loaf pan and pretty much let me eat as much as I wanted.
--Saigon d'Antan, a smallish vietnamese restaurant on Rue Monsieur le Prince. Sometimes you need a bowl of pho or some spring rolls to counteract the croissants and other heavy food.
--Creperie Little Breizh: breton style buckwheat crepes & cider, what's not to like? Near Odeon.

The 6th has good pastry shops: Pierre Herme has a shop on Rue Bonaparte, Eric Kayser has a shop on Rue Mazarine (with limited seating), Maison Mulot on Rue de Seine or Arnaud Larher just down the street....

A fun, only in Paris shopping stop is La Grande Epicerie on Rue de Sevres. It is a department store of food, with all kinds of high end ingredients. Can be a good place to buy edible souvenirs, like sea salt, spices, etc.

Just buy a baguette, some cheese, some wine and go sit by the river and enjoy

I didn't plan on it but I accidentally ran into Mass when I was in Notre Dame. Didn't even realize it was Sunday evening. That was my favorite moment in Paris and was one of the most beautiful experience in my life. Words can't describe.

I second Allard. The apple tarte there is unbelievably delicious. One of our favorite restaurants in Paris.