Extremely convenient, affordable and high-value hostel. Room was small with no windows, but had comfortable bed, table with chair for work, WiFi good enough for video calls, and a private bathroom. I stayed for 7 days and housekeeping changed towels and provided toilet paper mid-stay. Room is accessible via code so can check in any time of day.
Location is extremely accessible, roughly 1 minute walk to the Tsim Sha Tsui MTR station (basically on top of the MTR). Lots of good food nearby, very close to TST attractions.
Only downside is the building has several brothels, making it potentially less safe for female guests. But there is a proper lobby with security guard downstairs, and Airy Stay is on the top floor (9th floor) and does not share the floor with any brothels. In my experience even on weekends I found the building visitors kind and conscientious, and did not hear any sounds other than occasional cars honking and doors closing nearby.