Perth has a very varied restaurant scene. The area with the most diverse places would be Northbridge, just north of the CBD which has plenty of restaurants including Asain, Italian, tapas, burgers, and pubs available. Fremantle is the place to go for Italian restaurants and cafes. Leederville also has a good range of Asain and Tapas restaurants too
wherever you go there will be little cafes that make great lunch and breakfast too!