Myself and a few mates are returning from Australia to Ireland for Christmas and are thinking of stopping off for a few days in a European city on the way through (17th - 20th December). Having never been to any of the 3 cities mentioned above I was wondering if anyone can recommend which would be best at that time of year. We're all in our mid twenties so obviously good nightlife is important. Would like to get a proper look around the city as well though. Happy to consider any other suggestions apart from the 3 cities mentioned above. Advice on where to stay, things to do, pubs/clubs to visit, etc would be much appreciated. Cheers!