I stayed in Gemma's house for four weeks with my wife and daughter (4 years old).
The house is situated in Rozelle, just a few meters off Victoria Road. Thus, it is perfectly close to the bus network with plenty of lines taking you into the CBD in (traffic permitting) not much more than 5 minutes. Check-in is smooth and easy with a key being deposited in a lockbox in front of the house. Communication with Gemma's co-host Kate was very friendly and (mostly) very swift. She was also happy for us to stay in the house until 1.30 pm on our check-out day (which was very helpful as our flight left in the afternoon).
The house itself is spacious and has everything you need. However, there was a damp smell in the house, particularly in the basement floor. Kate suggested that might be due to the large amounts of rain Sydney had had prior to our arrival and had moisture reduction boxes provided to us. In addition, as mentioned in some of the other reviews, some of the furniture was a bit old and worn out.
Furthermore, a bit more attention to detail would surely improve the guests' experience, e.g. there was a lot of weeds on the terrace, also a large plant had fallen over and the pot was broken. In one of the bedrooms, a lamp was broken and without shade and in some drawers and underneath one of the beds, there were socks and underwear (probably from previous tenants).