There is basically only three types in my experience, cheap dumps (these are walk-up places advertising massage downtown which are really in-call places, fob or druggy girls), therapeutic places (low mileage at most a happy ending, all of these places close by 9pm, girls vary but best places have pretty ones) and errotic massage places (higher mileage but all safe activities often body rub parlours but not only, girls vary and its hard/blue moon in sky/ to find a pretty one). So in order to establish best asian massage, you have decide which of the three doors you want to walk through?
It is easier to pick a best of spa in each of these three catagories than to try and find a high service level, good rate, and high quality as there is none that does it all.
Forget about best location as there is none thats good for all.