Option A
In this floor plan option I have the sofa in front of the windows, an arched cabinet on the long wall with two chairs across from the sofa. A long dining table with a gallery wall on the back wall. See photo inspiration below.
Option B
In this option I have your sofa going on the back wall to break up that long wall with large-scale art going above. I made the dining table smaller in this option so that we could fit a narrow console on the back wall.
Colour inspiration
I think we continue with the black and white theme but we could add a bit of warmth with leather and wood accents. The dining table could either be dark like shown below with lighter wood or upholstered chairs or a lighter table ( still deeper than your floors) with darker stained or upholstered chairs.
