Financial Auditor Question:

You may have applied to work in a specific location, in which case you'll probably be asked why.

It might be because you'll be able to save money by living with your parents - it's fine to mention your personal reasons, but try to show that you've had a closer look at the office in question too. Perhaps it works with some clients that particularly interest you, or you may have met some of the team members at a recruitment event and got on well with them.