Hi, I ran this last year. I really don't remember any cobbles, if that helps! If there were any, they obviously weren't too bad.
It is a fast flat course. It was quite warm last year, sun was out, it was beautiful if warm for running a marathon.
The only negative remark I have is the chaos at the start pens - most people around me totally ignored which pen they were supposed to be in and just climbed the barriers - it was a bit of a crush, which was annoying to say the least. However it thinned out once we had got underway.
Hope you all have a great time. I am doing Vienna this year.