Decide first on the focal point of the room. It may be television, a piano, or a fireplace. Once the main focal point is selected, begin arranging furniture around it. Consider the traffic patterns through the living room. Furniture should be accessible and uncluttered.
Angles make a room warmer, giving it a casual, lived-in elegance.
Consider moving sofas or other large pieces of furniture away from walls. This can be done evenly or angled. There is now room to place a plant or area lamp behind the furniture. Decorative tables are not necessary on both ends of a sofa or love seat. Using one is totally appropriate.