Vilnius old town is not the main reason why you visit the city, but once you're there it's absolutely worth a visit. It's easy to walk around. There's plentiful of shopping opportunities and several nice cafes. Check out the nice chocolate shops. Some parts of the old town still needs some repairing, but the main routse have been fixed. There's lots of churches in the old town and even though you're not religious you should pay a visit to the many Orthodox churches that have lots of golden decorations and nice icons.