Great place to stay, the flat is nice, has everything you need in terms of amenities and lots of space. It's location is perfect, if you don't like walking, Kings Cross is right around the corner, so you can catch trains from there, Museum isn't very far either and Darlinghurst itself is just such a nice area, with plenty of cute cafés, bars and pubs and restauranants. Kerrie is just a great host, as we told her we would arrive late and she wasn't in Sydney at that time, she simply sent us the keys to the place we were staying at earlier.
In a nutshell, perfect base for a stay in Sydney.