The caretaker's office is the room where Argus Filch lives in Hogwarts Castle. It is connected to the Entrance Hall, in the Ground Floor of Hogwarts Castle. It's a small, simple room with a single oil lamp in the ceiling. It smells vaguely of fried fish. There are filing cabinets in it with details of the misdeeds of Hogwarts Students. Fred and George Weasley have an entire drawer to their own misdeeds. One of those cabinets is full of confiscated magic items marked "Confiscated and Highly Dangerous", in which Fred and George Weasley found the Marauder's Map. Harry found a Kwikspell letter in this office finding out Filch was a Squib. Mr. Filch keeps his chains and manacles (which are kept polished just in case) in this office.
