Bakery in Paris
My absolute favorite, who also happens to be in my neighborhood:
Everything is organic and -- when possible -- locally sourced.
Excellent bread and the second-best millefeuille I've ever had (the very best was Christian Constant…)
And speaking of Christian Constant, it's been almost a year since I've been in one of these eateries, but all three in the seventh are in the very good - excellent range: http://www.maisonconstant.com/en/