Hello from Wisconsin,
There is a bakery (gosh that sounds so terrible compared to the Boulongerie) where you get a coffee, a nice cafe and croissant for a low price. Saveurs De Pains. It supplies the local establishments with fresh bread every day and through the day. So it is not a tourist destination. There are a couple tables for eat in. High tables with bar stools. It is located at the intersection of Rue de Sainte Croix de Bretonneire (this is a narrow street so Google maps doesn't want to show the name until you really zoom in) and Rue Vieille due Temple. It can supply you with a nice fresh baguette sandwich or a dessert to be enjoyed in Luxembourg Gardens.
A second place that is very lovely is in the NE corner of Place des Vosges (Cafe Hugo) it opens at 7AM.
Both these places are fairly close to where you are staying.
Either of these would be a way to start to see the Marias. Think of the coffee as part of the touring.
The early bird beats the crowds, but little is open. I highly recommend looking at the city from dusk into dark.
A place you will never forget for lunch is right next door to the boulangerie on Rue de Vieille Temple, Au Petit Fer à Cheval. There are tables outside in good weather. Usually they are occupied. But walk in and around the horseshoe shaped bar to the door in the back. Take a seat and get the daily special. Once again, this will be real, not faked.
wayne INWI