Emma's place was small (as expected) but had everything we needed for a family of four and was in a great location. There's plenty of stuff in the area and easy access to public transport, and we even got our 7 year olds to walk back from Darling Harbour without too much bribery.
There was a bit of noise from a couple of doors down on Saturday night (but you have to expect a bit of that occasionally) but other than that it was quiet the rest of the time.
Other reviews mentioned that there wasn't a TV... there was one when we stayed that had Netflix and Youtube set up. There didn't seem to be an antenna for free to air, but who needs that anyway?