Hi, I can recommend few places were you can find really good food and good service:
Korean food Restaurant "Taste - JHK&DD's place" at Vokiečių gatvėstr. with really good Korean BBQ.
Restaurant "Rene" at M. Antokolskio gatvė st. here you will find perfect seafood and burgers.
If you like soups, In Panorama shop center there is a restaurant "Sriubos diena, restoranas, Origama", at Saltoniškių gatvėst. especially forest mushroom soup...yuummy.. :))
and ofcourse the best deserts place in town - "Sugamour" at Vokiečių gatvėst.