I stayed at Penny's and Jon's place for 3 nights. Penny's a gracious host and the room is self-sufficient and had everything you need. In fact, the day I arrived it was Christmas, so Penny had a bottle of champagne in the room.
The home is about 8 minutes from Arncliffe station and 4 minute walk from the bus station.
Couple of things you should know - Since the room is next to the airport, you might hear airplanes flying noise until 11 pm. Also the bathroom is being shared by Penny's clients so it is supposed to be very clean at all times, so if you cannot clean after yourself,this place might not be appropriate.