Apartment size may be described by number of rooms. A room in NYC must be at least 100 sq. ft. and have a window, except in the case of a kitchen. Most kitchens are counted as rooms, unless they are Pullman types, which are part of the living room. Baths are not counted as rooms. A three room apartment consists of a living room, bedroom and kitchen. A four room apartment could have two bedrooms, or a bedroom and dining room, a living room and kitchen.