I've found a design inspiration for my apartment. My place is very similar in layout (well, it's a mirror image): Tall ceilings with a far wall of mostly windows, a fireplace on one side with room for a couple of shelves behind it, and a narrowish space. The biggest difference is that where they have a couch, I have to have more bookshelves.
It gives me a good idea, though, for use of space, and it has a similar period feel built-in. My decor is parametered by not only the unit's moldings and the rather impressive fireplace but also by the mix of woods (birch accessories from Ikea, oak floors, and a dark fireplace with gilt trim). I don't have the choice of minimalism (which, in Manhattan is a form of conspicuous consumption, as it signals that your laptop and your holiday decor and your suitcases are all stored somewhere else). The room shown manages to use a variety of colors and designs without looking busy, which is what I'm most worried about.