An efficiency apartment is a type of apartment that typically contains a single room that serves as the living room, bedroom, dining area, and kitchen. It is similar to a studio apartment, but it does not have a separate room for sleeping. Efficiency apartments are smaller than studio apartments, and they often dont come with many of the features you'll find in a studio. The main room in an efficiency apartment is a multi-functional space that can be used for sleeping, eating, and relaxing. Efficiency apartments usually have a separate bathroom. The living room in an efficiency apartment also functions as the bedroom, and there is usually a kitchenette in the corner of the room. Efficiency apartments are a good option for people who want to live in a smaller space and save money on rent.