Guillaume is just a great boulangerie. My partner and I happenstanced upon here while we were walking in the area, and the bread smelled and looked so delicious that we had to go get cash at an ATM because it didn't take credit card. That extra bit of effort was definitely worth it.
The boulangerie itself is very small, and can get packed pretty easily, but this is the kind of place that even locals go to because they know how good the brightest. Plenty of variety of the bread, and it is made on site, as you can see from in front of the caisse.
I definitely recommend this place!