I'm in
Hanlun Habitats in Mid-levels (well, I'm in Sri Lanka right now, but most of my stuff is there

) who charge by the month, rates from $18000 to $33000, depending on the apartment size/shape, the building, and the floor you're on - my place is very much towards, though not quite at, the bottom of that range.
It's worth noting, depending on what you want and where/when you want it, that you may find problems with availability...