Nina, Paul shops are in many places around Paris, so you should check the location portion of that website to find one close to your hotel. The only one I have been to was in the 16th in an arcade. I use the Paris yellow pages, although there are other mapping web sites equally good, to print out the location. The bread freshness really depends on whether they bake several times a day, or just once early in the morning. If you buy during the post-work shopping rush at, say 6-7 PM, the bread could be pretty stale by then, so that is something to watch for.
wgd.pagesjaunes.fr

