I believe Bliss Spa at Whotel is the best or one of the best. This spa is known worldwide and the therapist are trained and study at Bliss Spa HQ. So no agency involved( I mean they dont take cheap labour and say we have therapist consultant) and when you talk to them they know what they are talking about it(about your skin problem). Prepare your wallet coz is not cheap but I still believe it is value for money.

I also have heard about Dados in West Bay but not sure how is it. My friend gave a voucher to her husband but I havent heard about his feedback. Anyway ....

Good Luck