Exceptional selection of travel books and guide maps rarely stocked with such consistency, and from less-easily-found publishers you are unlikely to find in as great a number elsewhere.
Also knowledgeable, empathetic support from the helpful staff. And it's located in a weird basement level abode off an interesting street location, just as all magical book shops that lead to great adventures ought to be. Might as well go enjoy lunch at nearby Terroni to celebrate your going on a trip...