Hi Rover,
I used to live in the inner west. Frank's Pit Stop in Ashfield is pretty good. Frank's a good bloke and likes his Alfa's, he's in the club and advertises in the mag. I still go there now and again even though I've moved away.
In Five Dock there's one on Queen Street behind Parramatta Road, a few blocks east of the Bentley dealer. Never been there (I drive past it on the way to Frank's) but they have a good reputation and a nice assortment of cars waiting for service. The name escapes me at the moment but drive along it and you'll see it. (Monza motors rings a bell). This one is more of an Alfa only specialist than Frank who does a lot of other cars.
I'm guessing yours is a 105 series. Manning Motors in Brookvale is really good at 105's and I take mine there for serious work. I'm off there (almost a 1 hour drive for me these days) this morning so you could take that as a recommendation.
Oh, and this forum is really helpful and you'll find almost anything you want. It does help to be more specific in your questions. I saw your post and Robert's first reply and thought there's no point me saying anything about someone in Sutherland who only does 166's.