Decorating with a brown couch?

We're getting a brown microfiber couch, it's called espresso. With my current decor, I have all black accents - black shelf, black oriental rug, black frames, etc. Is black and brown too dark? We're trying to decide on a paints color. Picture brown couchs and ottoman, with black shelves and frames and rug, and dark brown wood end table and tv stand. First of all is that ok? I don't really want to buy all new decorative accents. Second of all, what color would I paint the walls? We need two colors since we have a chair rail.