This is for Barbara Schmitt who, with her husband, will be visiting Paris 
and Florence in March and is looking for bakeries in those cities.
Let's take them one at a time:
Paris:  I urge you to get two books; "Boulangerie" by Paul Rambali, and 
"Paris Boulangerie-Patisserie" by Linda Dannenberg.  You will be able to 
compile a list from these two sources to more than keep you busy in the 
City of Light.  Don't miss Ganachaud on rue M=E9nilmontant, La Flute Gana, 
and Max Poilane.
Florence:  There are bakeries all over Florence and I am at a loss to 
recommend any in particular.  I do urge you, if possible, to get out of 
Florence and into the hill towns of Tuscany to visit the little 
out-of-the-way bakeries.  I was in one where they took me downstairs to see 
the oven.  It was a wonderful place with a coating of flour over 
everything.  The aromas of the wood, the flour, and the finished loaves 
created a magical place.
I hope this helps and that you have a wonderful time.
Bob the Tarheel Baker