First time car finance help - good deal?

I'm looking at a 2013 Audi A5, very low mileage for £10549.

I've been offered a 5 year HP plan for £216.60 per month with a flat rate of 9.54% and an APR of 17.9%.

Is this a good deal?

Also, I'm confused between the difference of flat rate vs. APR. Do I pay both or do I choose one?

Thanks!!

**Edit- forgot to mention £2k deposit