Similar structure to the MBR. P would love it. Replace fireplace with bed and get small electric fp for up there. Warm tones, warm lighting, wooden furniture, lots of lamps. Could go a little more British Colonial.
Sunroom nook with floor to ceiling windows. (Off the dining room is an elegant nook for curling up with a good read. I adore the archway and all the natural light streaming into the room. And the chandelier makes it a whimsical retreat!