If "worthwhile" in your title means worth a review, we'll look forward to yours. But there's a reasonably obvious reason why you're not finding many reviews. There just aren't [m]any 'worthwhile' places.
If you're not looking for top drawer Kawaii's OK, and people have said OK things about Spring Green. You might also get more interest if you said more: what you're after in a MPA, in a massage, in upgrades, what you see as the difference between mediocre say, and 'worthwhile', what your idea of downtown is?
"Name a place I'd like", isn't easy or very inspiring, even if you say please.
BTW:, in case of confusion MP is a parlour, MPA is an attendant who works there. Usually she's the one we call hot.