If you are wanting to visit Sydney or just make sure you're near the airport, I can't recommend Beverley and Michael's accommodation highly enough! They are both incredibly welcoming and well travelled people, so understand if you just want to get your head down or need information about how to get to the places you want to visit.
The accommodation is only a five minute-ish walk from the main train line out of Sydney (which is unbelievably reliable and cheap from Sydney to Mascott), and I would recommend, as Beverley did, that a taxi to the airport is just as cheap if there's three or more people.
Even though we were leaving early, Beverley and Michael were up to help us with the suitcases. They could not have done more to help us.
The beds are really comfortable, breakfast was delicious and the hosting was absolutely impeccable. Thank you Beverley and Michael for such an amazing last night in Sydney.