Designing With Rugs | A good example of a properly sized living room area rug

A good demonstration of a properly sized rug: ... | Designing with ...

A good demonstration of a properly sized rug: large enough to unite all elements of the seating group; not too large however that the front legs of the sofa encroach beyond the inner guard stripe of the border; evenly bordered by the hardwood floors at the ends and behind; and does not encroach beyond the border in the floor for the hearth. 
Also a nice example of the rug establishing the  room, but not overwhelming it. You can comfortably appreciate all elements of the decor without forced attention on the rug.