While this house is beautiful and magnificent, it probably also needs to be gutted, insulated, rewired/replumbed, and lacks common hidey holes for central air. All those shingles are custom now, and the whole thing needs repainting regularly. The doorways and stairs are narrow, and most of the rooms are small by today's standards. The windows aren't low-e, and even with all that, it'll still probably leak air like a sieve.
It is a magnificent house, but it's also an absolute money pit to maintain, heat, and cool.