Whatever you do, don't get a poodle. Used to work in an animal clinic for about 3 years and I'm ready to say that every poodle is a psycho.
Yorkshire Terriers live forever and seem to have very few breed-related illness. They are small and usually not to loud, and temperament seem mild enough.
Pomeranians and Chihuahuas are also small but tend to be very loud. The genetic pool of Poms in HK seem to have a lot of patella (knee cap) issues, I've seen many poms requiring surgery for both knees by age 3.
If you mean to keep them in air conditioned apartment most or all the time, pugs and french bulldogs have very lovely temperaments ... but they tend to have trouble breathing in the hot and humid climate so don't take them outside for too long. They (as well as Pekinese) are also prone to spinal issues so don't encourage too much jumping or standing upright like bipeds.
Oh, and don't get a whippet either... a friend of mine in Yuen Long has a whippet and just about killed himself trying to chase it home everyday after it jumped the fence for a bit of freedom. Eventually the owner got a german shepherd as "companion," the idea is that the GS would "herd" the whippet home, unfortunately, the whippet outruns the GS every time...