no but I got the train to there in March to get a flight home. It looked great from the train, enough to make me want to go and spend a few days there.
the airport is pretty grim but I'd imagine worth enduring if the city is as good as it looks.
The old town is alright, but not amazing if you've been in five other European oldtowns. There is some live jazz bar in i liked a lot.
Take a few wee trains and head here though and expect to spend half the wandering about the place - especially if you like looking at giant rusty stuff