Welcome to the unfurnished apartments group of SmartGuy.com, Feel free to interact with other professionals from across the world. You can find professionals, find deals on services, find professionals who might barter, or simple post questions, comments, or suggestions. An apartment, flat or unit is a self-contained housing unit that occupies only part of a building, generally on a single level. Such a building may be called an apartment building, apartment complex, flat complex, block of flats, tower block, high-rise, etc.