Would definitely recommend Sinead's studio, and would stay there again.
Great location in backstreets of Newtown, assuming you don't want to stay in CBD. But Newtown is a great place in Sydney (I lived there for 5 years!), with great local restaurants/bars/shops, and only 10 mins walk to train stations, with a few stops on train into CBD for any connections via train/ferry etc.
Really clean, super easy check in, and great communications. Can't ask for more.