We really appreciated how close we were to the Darling Harbour with all the cafes and restaurants in easy flat walking distance. A 5 or 10 minute walk to the train station (depending which station you're using) and if you don't mind walking for half an hour; the CBD, Harbour Bridge and Opera House are nearby also (or take a bus or train if you don't fancy walking). Shopping is also handy - and amazing!
The apartment itself is spotlessly clean, with everything you might need including crockery, utensils, shampoo, hairdryer and extra blankets etc. We were very comfortable and didn't want for anything during our stay.
The host was helpful in answering questions and always answered very promptly.
I'd definitely stay here again and recommend it highly if you're looking for a great place to base your holiday in Sydney.