A big thumbs up from me for Vilnius. Whilst the main sights are nice they are not astounding however the city has a great atmosphere and wandering aimlessly around the old town’s cobbled streets was an exceptionally rewarding way to spend a weekend.
I spent three days in Vilnius in February 2010 using it as a base to explore south-eastern Lithuania and it was great. It reminded me an awful lot of the Czech city of Olomouc, where I studied a few years previously, and for me that is a big complement. I really enjoyed just walking through the winding lanes discovering bars, cafes and quite a number of churches. It was also good to see the University was a core part of the old town and the students sauntering to and from classes brought a relaxed air to the place. They also made the nightlife very enjoyable Cozy, Prie Universiteto and Bûsi Treèias were the drinking establishments I enjoyed most. Whilst walking between bars I also got to hear some of the incredible folk singing that the Baltic States are so famous for. It was very different to the sort of post-pub singing you hear in Britain, four part harmonies instead of a drawl about a favourite football team.
The main sights of the city were nice, especially St Anne’s church and the Gates of Dawn. The two big squares, by the town hall and the cathedral felt a little too open and ordinary in comparison to the surrounding streets. However the view from the Higher Castle and the Artillery Bastion were particularly pleasant. It does all manage to squeeze in a Micronation in the shape of the Uþupis Republic).).
Vilnius was a really charming city with enough to merit a few slow days of exploration. It has a real central European feel and is one of Eastern Europe's largest preserved Old Towns and a worthwhile inscription on the World Heritage List