From the Super Mario Wiki
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The Entrance is the first room of Gloomy Manor in Luigi's Mansion: Dark Moon. In this room, there are 3 doors; one to the left that leads to the Garage, one to the right that leads to the Mudroom, and one forward that leads to the Guard Hall. There are also two suits of armor in this room, a coin painting, which Luigi can use the Dark-Light Device to gain coins from later on, and a chandelier, which Luigi can point his vacuum towards to make the room go dark.
During Gear Up, a Greenie who stole the key to the Common Hall hides here. This is the only time in the game the entrance is haunted.