I say that people must set about making such houses for us immediately. For free. Just because we're such great and deserving people.
I was going to say never the drawing room, under any circumstances, since I'm sick to death of all the action taking place there, when supposedly this is a huge mansion with, I don't know, hundreds of rooms? But, how many other rooms would be familiar enough for us to want them, and you sort of have to have it. So, reluctantly, the drawing room and postage-stamp-size foyer (as DC put it). Quentin's room would be atmospheric and cozy. The Old House main room, though the pastel 1795 version might not do. The basement home of the coffin, maybe. Then (did we get 5 choices? Let's say 6) it's up for grabs betwixt the gracious living room of Evan Hanley, or the gracious Collinsport lair of Count Petofi.