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The 3D model of the house needs a way to ascend your view, it's really difficult navigating it. Every time I try to look around 360, I'm zoomed out and fly out of the building. I'm trying to find the stairs on the second floor, and someday I believe I will. I will mention the stairs overlap the door on the first floor.
Whether that's the intention of infernal architects or an error is something my mortal mind will never know. The table in the main foyer on the 1st floor and pot of flowers are also not... together, so there's this pot of flowers floating near a table when you first enter.
Update: I think I have figured out 90% of the house.
@Queen of Aces Question, is the right side of the house supposed to have a blue interior for the third floor, and how do your access the dorms on the left side, as there's only one set of stairs I could find leading to the third floor, unless I still haven't found the second set lol.