Berlin Marathon is a great event! Greatly organized, course is fantastically flat and aid stations very well placed and loved the cold bananas! Access extremely easy from anywhere with the amazing Berlin transport system! On top of that the city is great and offers a lot at very reasonable prices!
Only gripe we all have is the lack of a t-shirt... would rather pay more for entry but need a t-shirt that even the race in the villages provides...
Apart from that... definitely a must!