Charms classroom

The Charms classroom is located in the Charms Corridor on the third floor of Hogwarts. It is located “miles from the trophy room”, but close to the forbidden corridor where Fluffy was being kept in Harry’s first year (PS9). It has one window that overlooks the front entrance of Hogwarts (OP30):

‘Should we say something?’ said Hermione in a worried voice, pressing her cheek against the Charms window so that she could see Mr. and Mrs. Montague marching inside (OP30).