Neville's Office

Neville’s office isn’t in the castle.  Well, there is technically a room assigned to him (third floor, fifth door on the right, mind the re-located portrait of Sir Cadogan).  But if you needed help with your Herbology assignment or were sent to see the Head of Gryffindor House about that parakeet you snuck into the fifth floor girl’s toilets, you would never find him there.