It has a really convenient location, right next to the Kongresni trg. You can just grab a slice and go hang out in the Zvezda park. The pizza's delicious and it's always fresh (they make new ones all the time because it's frequently visited).
Go to the pizza place on the Kongresni trg, not next to Ljubljanica (they don't have the pizza slices there-but the pizza's still good).
Su: 12:00-23:00
Mon-Sa: 10:00-00:00