Keeping things to scale. All of the designers here emphasize the importance of furniture size in a living room. "Correctly scaled furniture can make or break a room," says Austin, Texas, designer Allison Jaffe. "Having too much room or too little room can really throw off the look and feel of the space."Just because the size and scale of a piece looks right in a store doesn't mean it'll feel right in your living room. Larger rooms require larger furniture, and smaller rooms require a smaller scale. But above all else, make sure whatever you buy is comfortable too. "Select furniture that fits you," says Schumacher. "Try out different sized pieces. We've found some people prefer larger furniture they can curl up in, and some people prefer more petite furniture."