This is a serviced studio apartment very close to Darling Harbour. I was lucky enough to be the first AirBnBer to use it :). Brand new pots n pans, all the essentials, good WiFi. The pool and sauna are shared with the hotel it is part of. They are decently sized - quite nice.
It's operated by a rental co, who were super helpful - they met me in person, explained all the facilities etc.
The bed is a soft bed (new I think - its just the choice), so if you're looking for sink-into-it comfort, this is definitely the place to go :).
I will happily be looking for this place again on future trips to Sydney.