This is a great and unique place to visit and enjoy. My family and I spent an afternoon there after a morning visit to Sovana (a beautiful village definetely worth a visit). If you are planning to go make sure to bring: a large towel to change, or you can use the portable potty at the coffee shop, but the restroom there is not very big; also, I wished I had a pair of water shoes to walk more comfortably in the water. The sulfur does not smell too bad at all, the various little waterfall, provide a vigorous massage, and the mud, more available in the lower part is really great for the skin. If possible choose a cool day , since being this location farther away from the coast (50 minutes circa), it could get pretty warm and humid of course.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.