When to go
All months of the year are suitable to photograph this spiral staircase.
Tai Kwun Contemporary is open from 11am to 7pm (until 9pm on Fridays), but I recommend getting there early to avoid the crowds.
Field tips
Bring along a wide-angle lens (I used a Moment 18mm lens and attached it to my phone) and shoot with a wide aperture, as the light inside the building isn't great.
Try to position yourself so that the spiral is symmetrical and in the center of your frame.
If you want people in your image, be patient. There are quite a few people walking up and down, but I got lucky with this one as there was a couple shooting their wedding photos.