It is a gloomy and dimly-lit room found in the school Dungeons. The shadowy walls were lined with shelves of large glass jars filled with slimy, revolting things, such as bits of animals and plants, floating in potions of varying colors. The office has a fireplace. In a corner, there is a cupboard containing the professor's private stock of potion ingredients. The office is sealed with a spell only wizards can break.

The Slytherin Dungeon is located behind a wall in the dungeons of Hogwarts. A Password spoken to the wall is required to enter it; whereupon a passage is revealed leading to the Common room -- a low-ceilinged, dungeon-like room with greenish lamps and chairs. This dungeon extends partway under the lake.

The Slytherin boys' dormitory is a room off of the Slytherin Common Room where male Slytherins sleep at night. The walls are decorated with Slytherin crests.