Vilnius is a spacious, beautiful and surprising city. A lot of cosy and narrow streets, richly decorated churches, old castles (Trakai!) and interesting museums (for example The KGB Museum). It was quite cold, definitely colder than Poland same time of year. Definitely worth it.
If you were ever considering visit in Vilnius – go ahead. There’s really a lot to see, not only the obvious, touristic antiques. There’s much more. Like A. Pushkin Literary Museum, The Amber Museum, The A. Mickiewicz Museum. It is a dream come true for literature maniac as myself.