The address has changed to Pylimo 31
The information centre is not renting bykes any more.
I came to Vilnius in the winter and they only had one bike in "working condition" - though all the others really needed was some air in the tires and a little realignment. Anyone with any know-how in bicycles should start a business in Vilnius - they're clueless. The sweet info ladies promised me more bikes for the actual tourist season, so give it a try.