I've been to Boon Sappaya several times and it's been consistently good, with great atmosphere and massage therapists. I always come out feeling relaxed and refreshed - recommend trying the Thai massage.
My mom and I both had a Thai Massage and we thought that both of our therapist were exceptional. I have a frozen shoulder and she knew exactly which muscles to target to help me get greater range of motion. We got deep tissue work without overextending us doing stretches. My mom is very picky and she was thrilled. Additionally the space is very clean and professional. I was worried but very happy.