I went there a few years back and stayed in Qawra too - loved it!! If you get a chance take a boat trip to the Blue Lagoon in Comino - its beautiful and a great place to swim.
If you like historic places Valletta and Medina are great - not sure about nightlife as I went on a quiet break with my parents but I believe its a bit of a party island and really good in certain areas!!
Hope you enjoy it!!!