Bistro Bellavista certainly offers great service, great Italian food (especially that Tagliatelle Bolognese) and a lot of space to host group dining or family gathering.

Located right across Petition, Alfred's Pizzeria offered artisanal pizza and a great range of cocktails at their gangster theme bar. 

Porky's BBQ & Bar, serving authentic wood smoked American BBQ in Perth.  (Website)

We were intrigued and had an unplanned dinner at Porky's BBQ & Bar in Northbridge.