In our new apartment we have six shelves like yours, and I'm very happy with them ^_^. On the old one we had only four, but had a lot of books all around the place (in the kitchen, in the bedroom, in the living... -the shelves were on the corridor because the living and bedroom were so tiny that we couldn't put them there).
I still have some books on the main bedroom, some of the books of my daughter and some mine because I always have books on the nightstand to read when I go to sleep.