GTA - he didn't ask about quality of the massage, he asked who is the nicest, and most friendly. Also, it is not my experience that 'the young ones are just there for the buck'. In fact, all of them are.
In terms of nice, it varies from day to day, like any other human being. We have good days and bad ones. I'd say check around in the reviews, take note of the ones from the last 3 months and book accordingly.
Show up with a pocket full of cash, take a shower, shave, and present yourself in a friendly respectful manner, and you should have no problem finding someone friendly. or at least, someone willing to fake it for 30 minutes.