It's a matter of personal taste and balance I think. I have loads of books, one complete wall of floor to ceiling book shelves and many house plants, some 'artistically' growing down from top of said book cases, but I have no ornaments, can't stand them. Coffee table is never clear, but the magazines and books are neatly stacked. I dislike housework, but perversely like a clean house. I once had a friend who was obsessive about getting jobs done on the right day, this included coming in to the spare room where I had stayed overnight, by invitation, and asking if I would mind getting up ( 8am) as this was her day for stripping the spare bed, including mattress cover!