A room which is not a public hall, public vestibule, public room or other public part of a dwelling. Every room used for sleeping purposes shall be deemed a living room. Dining bays and dinettes fifty-five square feet or less in floor area, foyers, water-closet compartments, bathrooms, cooking spaces less than fifty-nine square feet in area, and halls, corridors and passageways entirely within an apartment or suite of rooms shall not be deemed living rooms.