I recently purchased a second hand Golf R MK6 (2013 model) in manual, it still has less than a year left of warranty.
When the car idles, I can hear a slight rattle noise coming from the engine compartment. It is most evident in my garage as there are no outside noise interference. When I press the clutch pedal that rattle noise disappears, but, when I release the clutch pedal, it comes back. It's a different rattle noise then the engine noise. Not sure if it's the clutch plate or the flywheel that's causing it.