never tried it on the RNS but it does on the discover pro. RNS isn't in the mk7 and you've posted in the mk7 board.
I use spotify with my DNS, it plays ok, and you can skip to the next track.But that's it. No album art or ability to access playlists etc.It would be great to have the spotify front end displayed in the car but I doubt that will ever happen.
That's a pity then and is exactly the same on my BMW. The bluetooth streaming sound quality is surprisingly good though. I use a Kenu Airframe to mount my phone on the dashboard vent. These mounts are fantastic and I'd highly recommend them.
I've not tried it in the car, but Deezer is a better app than Spotify - give that a go!