If you ever need to send your PC back for service, you can have the people at the local mail shop pack it. It will cost a little bit of money, but in the meantime you'll have lots of extra space. In big cities there isn't any more space to spread out, so people build upward. You can do the same. If your bookshelves only come to chest-height, get taller shelves that go above your head.
China cabinets are more space-efficient than buffet tables.
A shelf-type headboard takes up much less space than two nightstands. Look around your apartment to get a sense of how much empty space is available above waist height and start thinking of ways to fill it. We finally decided to put both futon mattresses on our bed. Fill in empty spaces I know. I bet you can still find some.