I can't speak about the spa because I just went here for the gym. I was a guest at Bally's, where the fitness center didn't fit my needs. (It was nice, but I am a power lifter and need free barbells.) The gym at Mandara in the Paris was better equipped for me, but technically I wasn't supposed to use it without paying a crazy fee, if at all. Gionni, the manager, was my saving grace. He worked out a deal with me that was way better than the original situation, and even wrote a note to other staff members to honor the deal if he wasn't at work. He also showed me a great act of kindness on my last day of vacation!
I'm only giving four stars because I'm technically not reviewing the spa, really just reviewing the gym and management. In a city where it's easy to squeeze dollars out of tourists, it's nice to meet someone who wants to help you out.