Good old Billy bookcases.

That's 2 down (or up in this case) and 3 to go. Have yet to fix to wall, put cornice around the top etc. Should provide a bit of storage! We can empty boxes we have already, to provide space for rest of our stuff from storage on Monday.
Ikea have sold over 60 million of these..
Extra :
How some of them looked in our last house.