We really enjoyed staying in Steven and Peta's back garden cabin. Beautifully clean, light and had all the essentials. We came with our two young children, and our hosts gave us various options (we settled on a queen sized mattress on the floor for both of them). It was perfectly adequate for four, and for one or two people it would be positively spacious. Petersham is just a short metro ride from the centre of Sydney, and the cabin is just round the corner from a lovely parade of shops and restaurants, so you will never be stuck for something to eat or drink.