I would wholeheartedly recommend this apartment. A bus going into the city departs just outside the building and Kings Cross station is within walking distance (10-15 minutes), so going into the city centre is very easy (I would recommend that you take the train during rush hour as the bus will get stuck in traffic).
There is a gorgeous view of Rushcutters Bay from the top of the building, a view which you can enjoy whilst cooling off in the rooftop pool.
The area was a little noisy in the early hours, although I suppose that is to be expected given that it is a residential area.