The Thai Spa has their branches in almost every states of India. But I know only about Kolkatta as one of my friend went to it when we went for a tour in West Bengal. According to her it was the best spa she has ever visited, she said it almost took all the tiredness away from her and made her very relaxed. The spa therapist were very good and the place has very kind and caring staff members.
The infrastructure is very good and the place inside is very peaceful. They even play slow music in the back.
The Spa treatment do have the value for money.