The Gryffindor common room is in one of the castle 's highest towers .
Common room 's entrance is on the seventh floor in the east wing of the castle and is guarded by a painting of The Fat Lady , who is garbed in a pink dress .
The Gryffindor common room is in one of the castle 's highest towers , and its entrance is on the seventh floor in the east wing of the castle and is guarded by a painting of The Fat Lady , who is garbed in a pink dress .