An indoor common area must be provided for the exclusive use of the guests, and must be a minimum of 100 square feet if less than six individual sleeping accommodations are provided, and a minimum of 300 square feet if six or more individual sleeping accommodations are provided. Common areas may include, but not be limited to, a combination of dining rooms, parlors, sitting rooms, libraries, solariums, enclosed and heated porches or like facilities and are exclusive of bathrooms, closets or other nonhabitable space.