Tattva Spa at Marriott Hyderabad is considered to be a good spa for several reasons. It offers authentic Ayurvedic treatments and therapies that are administered by well-trained therapists using high-quality natural products. The spa has a serene and relaxing ambience, and the staff provides excellent customer service. Additionally, it is located in a convenient location, making it easily accessible to both locals and travelers. Overall, Tattva Spa at Marriott Hyderabad provides a perfect escape from the hustle and bustle of the city, and offers an excellent spa experience.