Pain Quotidien, fast food my way
A great example that chain stores are not always bad, Le Pain Quotidien, with five shops in Paris alone, is always a lovely place to drop by for a quick tartine or a slice of something sweet and fruity.
I am particularly attached to the one in the Marais, where you can find a table out on the wide sidewalk and while the day away, reading, writing, while drinking a nice little cup of coffee or munching on something yummy.