Know what room you want it to be positioned so as to know a rug's function; whether it stands as a mere floor covering or a wall décor. Pondering on a rug's function will allow you to consider the material of the rug. For rooms with heavy foot traffic like living rooms and dining areas choose a rug that is made with fibers that are resilient to dirt and stains; specifically natural fibers like wool. If you wish to use an area rug as a wall décor (like tapestries) choose rugs made of natural silk; since silk tends to last better than other natural materials because of its delicate and lustrous quality.
Who says size doesn't matter? Who would want to choose a rug that is so undersized or too big? Standard sized rugs such as 3 x 5's and 4 x 6's are usually placed in rooms to accentuate furniture and inglenooks. These rugs and even smaller can also be used in entry ways kitchens and bathrooms as a floor mat. Larger rugs like 6 x 9's and 9 x 12's are commonly used for living rooms and dining rooms. Again know where you want the rug to be placed.
Hallway Rugs. Depending on the size of the hallways in your home you will likely need a long narrow area rug - or runner - for this space. In order to achieve a balanced look and find the right size rug for your hallway keep in mind that the rug you select should be two to four inches narrower than the width of your hallway and 18 to 24 inches shorter than your hallway's total length.