Bedroom (Luigi's Mansion: Dark Moon)
From the Super Mario Wiki
The Bedroom is a room in the Gloomy Manor in Luigi's Mansion: Dark Moon. This area is accessed by taking the middle door in the Master Hall. The Bedroom has a folding screen that Luigi can look into to see a gem. There is a stove and a closet with coats hanging, as well. The door which looks like the one to the Study is actually a Trapdoor. Pulling on the cord near this door reveals a bed that Luigi can sit on to be taken to the Study. He can also look through a hole after sucking up the clothes to get a brief viewing of the Study.
During A-2: Gear Up, Luigi needs to go to the Bedroom in order to go to the Study and take back one of the gears stolen by one of the Slammers. In A-5: Sticky Situation, the Bedroom is one of the rooms that is always covered in spider webs.