Roswell bokstore is located beneath a furniture store that faces Alpharetta highway. You have so go to the back of the furniture store and enter from the side. Inside is a maze full of twisty little passages, all lined with books. They have a great selection of science fiction and fantasy, general fiction and mysteries. The stock turns over fairly regularly, too, so there's always a chance to find a new book by a favorite author ... I've found a series of Nero Wolfe novels there long since I thought I'd "read him out."
There's also a nice selection of Southern books and local (Roswell area) interest books. The staff is friendly but willing to leave you to your browsing. It has that mom and pop small biz feel that used bookstores seem to have more than any other kind of store.