Why does the Audi A1 utilize a transverse engine layout?

I've noticed that some other luxury car brands use longitudinal engine layouts, where the engine is mounted lengthwise in the car. But the Audi A1 has a transverse engine layout with the engine mounted sideways. What are the benefits of this and how does it affect the performance of the car?

The transverse engine layout allows for a more efficient use of space within the car, as it allows for a shorter front end and more room for passengers in the cabin.

Furthermore, because the weight of the engine is evenly distributed across the front axle, the Audi A1 has better balance and handling, resulting in a smoother and more controlled driving experience.