Window seat with built-in bookshelves. Could use IKEA: Hemnes daybed kitchen pullouts each), and Billy bookcases each or with uppers each). Total cost with knobs, trim, paint, etc. would be about The skylight is a nice touch too!
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!