235/35 R19 will be fine on your set up, as previously mentioned the handling will not be a good, for that the ideal is 17", but unless you are tracking the car regularly it doesn't really matter. For looks I think 19 is the perfect size for the mk5. As to the ride quality, a friend has just swapped from 18" wheels wearing 225/45, to 19's wearing 235/35 and he reports almost no difference, the only thing is he spends more time looking for pot holes.........but I do that running 18's!!
Welcome to the forum by the way.