I stayed in Mark & Anna's place for a month and I really enjoyed it. They were overseas at the time but Mark stayed all the time in contact.
The apartment is exactly what it seems in the pictures, cozy, urban, stylish and tidy. The kitchen is well equipped and I really liked cooking in there. Located in Surry Hills it is so central that I could do most excursions by foot. Otherwise it is 7 minutes from Redfern trainstation, so I could go in any direction without any hussle. According to the railroad and two main thoroughfare it is noisy 24/7, but you soon get used to it..
Mark & Anna even prepared a little booklet about, how to go and where to go that was very cute and helpful. They were always a message away even considering the huge time difference.
I would say dont even think about twice, this flat and the owners are what you are looking for in airbnb.