Thanks for the replies!
The problem is, I have hardly any other options available, given that I'm trying to bring my friends together w/o making them pay too much on air/rail fares.
I had considered Brussels or Paris, but the latter doesn't appeal to me anymore in terms of nightlife and living.
Where else would you recommend, given that we'll all fly/take the train from either LHR, MRS, CDG, GOT, NUE, VIE, ZRH and NTE?