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!
Explore Domino's guide to decorating with rugs that come in every color, shape, and form to create the chicest space. From Moroccan and geometric, to hide and shag, there are no shortage of ideas that will inspire!