This is a very popular question and a worthy one of plenty of thought.
Most homes have 3 or 4 bedrooms, however we have been finding lately some of our clients requesting on our double story designs to have four bedrooms up on the first floor with a fifth bedroom located on the ground floor.
The fifth bedroom is a very handy addition to any home and being on the ground floor is a real bonus for those older visitors who need a room for the night or two.