I was out in Hong Kong in March last year and used this agency http://escortgirlhongkong.com/index.html
Phoned them up with my requirements, they then asked for a confirmation of my name, hotel and room number by text. They then phoned the room to confirm.
They were pretty efficient and reasonably priced compared to a lot of other agencies out there.
The girl I saw was http://escortgirlhongkong.com/girls/moon.html-
very petite and willing but certainly older than advertised. Services on offer FK/DFK, OWO, her rimming and fingering my arse, sex in loads of positions and on various items of furniture- no cum limit.
However, this was 18 odd months ago so things may well have changed but based on that experience Id give the agency (and probably Moon as well!) a shot if I went back.
Hope that helps.