I have a long, narrow but not large living room. it is located on the mid level and has two separate staircases leading to two different rooms making placement of furniture difficult. I have a sable colored velvet Chesterfield style sofa with 2 chairs . The chairs are situated in front of my fireplace . What shape coffee table should I use? I don't want it to take up too much space and to block the staircases. Any advice would be greatly appreciated. Thanks!