Many years ago, we stayed there once... the hotel is old but has a colonial style. We stayed about 4 nights, and it was OK...the rooms has lots of wood, and the lifts are unique - the old chain gated typed.
The once upon glamorous hotel was actually the private residence of the Sassoon family and as a grand hotel, then called as Cathay.
If you go to the ballroom on the 8th floor it is deck with lots of trimmings of the many years ago era and also the bar, you see lots of Art Deco (reminds me of French Rene Lalique works) and they are gorgeous.
Steven Spielberg filmed part of Empire of the Sun here.

