There are three Jubilee Cafes in Malta, but I haven't made it to the Gozo version, so can only comment on the other two. Jubilee Gzira was one of the first places in Malta I went to for a beer, and I liked it straight away. Deliberately trendy in a vintage style, lots of corners and alcoves, things glued onto the ceiling upside-down - you get the idea. The food is good as well, Dany reckons the pasta here is the best she's had in Malta, and who am I to argue? It is a little dark inside for a sunshine spot like Malta, but then that can be a nice change sometimes. The Valletta version has the same decor, but is smaller and busier, which is not a great combination. If you go here if feels like you're pretty much expected to order food, which is not necessarily the case in Gzira.
Decent bar/cafes, worth a visit if you've had enough sun for the day.