This is a lovely bnb in Balmain, which is a great location, near the ferry, a fifteen minute ride in to Circular Quay, but far enough out to escape the centre in the evenings and enjoy the excellent choice of local restaurants.
Rosanne and Adrian are great hosts, making you feel welcome but still allowing you lots of privacy. Breakfast is continental and help yourself.
If you are going to Sydney for a few days l would recommend you consider this option.