I stayed 4 nights here with a double bed and my own bathroom. The place was very secure and handy to Central Station. Good sound proofing from the busyness over the road at the station, along with a comfy bed made sleeping easy. The only issue for me being sensitive to smell was someone cooking in the kitchen late at night and the smell permeated my room (being up the stairs directly from kitchen). I think airflow is not the best in this building but there is an air purifier on 24/7 in the stairwell to manage this. I was pleased to be able to open my bedroom window but then had the traffic noice!
Overall this is a really comfy, clean, well located accommodation to central Sydney with 2 great breakfast/coffee shops directly below...ideal for a few nights in Sydney.