Apartment 4A is located on the fourth floor of the building across the hall from Apartment 4B, where Penny lived and where Sheldon and Amy live now. Apartment 4A is known to be a corner apartment, being that it has windows facing outside on two sides. It may, in fact, be one of only two apartments on the floor, and may therefore have outside walls on all sides (other than the wall shared with the fourth floor hall and stairwell. For information on the actual view from their apartment see [1]