Very nice experience this time. Liang is very nice host and his parents live with us together, and they always provide the help quickly and kindly.
The house location is also good, 10 minutes walk to train station and shopping center. And 2 minutes walk to Woolworth nearby.
Only need 1 hour and 30 minutes at most, we can visit any famous viewpoint like Town Hall, Opera House, Darling Harbor, Bondi beach... Even I found a good route for running around the Marquaire Uni.