Where is the secret room in the Woodland mansion?

Where is the secret room in the Woodland mansion? A way to look for a secret room is looking for gaps between normal rooms, this way is the best on the first floor, as there are no windows. Another way is looking through the windows through the second and third floors of the mansion, since some secret rooms are exposed to windows.

A way to look for a secret room is looking for gaps between normal rooms, this way is the best on the first floor, as there are no windows. Another way is looking through the windows through the second and third floors of the mansion, since some secret rooms are exposed to windows.