I can thoroughly recommend Stephanie's apartment in central Sydney. I spent three nights here with my two children and it was perfect for us. The location is excellent - a couple of bus stops, or a 10-minute walk, to Central Station, from where it's easy to get down to Circular Key (most conveniently by using the free shuttle bus no. 555) and other points around the City or the eastern suburbs. Central station also links very quickly to the airport. From the apartment, Darling Harbour is just a walk away. The apartment itself is great - plenty of space for the three of us, wooden floors throughout and lots of little touches which made it a real home from home. Having essentials such as milk and butter provided was very helpful, and a bottle of wine and a jar of home-baked biscuits made us feel very welcome. Our arrival was very smooth - we were met at the apartment by Stephanie's parents, who were very friendly and easy-going and briefly pointed out what we needed to know. I can't thank them enough for accommodating our early arrival - not being able to check in straight away after our long-haul flight would have been difficult.
There's a fabulous roof-top pool and a gym in the building complex, and many places to eat within a stone's throw.
We loved our short stay in this apartment.