Went in '00 for the 6 days, day and night sessions. Had a great time. Airfares on Qantas are very high and seats sell out fast. I did it with one of the tour companies that do entire packages - air, hotel, and tickets - they even set up an afternoon of play at Kooyong - the old AO site (unfortunately it rained so we had to play on the fake red clay courts, not the grass). I used Grand Slam Tennis Tours - there are others that advertise in Tennis Magazine. Transportation around town is easy - you don't need a car because you can walk from CBD (central business district - downtown - where most hotels are) to Melbourne Park - or take a trolley.
Was also able to play tennis in the mornings on the local courts.