Vilnius it is a very beautiful city :) there people are friendly and nice, beautyful girls ;) you must come and see everything at your own, pictures are not the same!
In summer weather is good, not too hot and surely not cold.
You will see not just old churches and castles, but you will enjoy with parks, rivers, lakes, birds singing and many green trees in the center
Have a nice time :)

Well it was very interesting and had tones of stuff to look at. I taught me alot about histery because of all the stuff they had.