Setting up a interior home library is not too hard, you simply need just a little space where you could make simple bookshelves. What is important would be to make library interior materials accustomed to make bookshelves.
for kids room . Cute idea if your house is designed properly. I remember a family friend's house had a hidden play room under their stairs. To get in, we crawled through a little door in their coat closet. Way fun for kids!