My husband and I did this a few years ago and really enjoyed it. We felt very pampered. The private villa includes a treatment room with two massage tables, and a verandah with a hot tub and a double comfy lounger. You have some time in the hot tub, and then you each select a treatment (e.g. Swedish massage or hot stone massage, etc.), and your selection can be different from your partner’s choice. I don’t remember what the options were, but I think there were maybe 4 options to choose from. After the treatment, they serve tea while you relax on the lounger. All of that is included in the price.
I can’t remember what, if any, add-ons were offered for the massage, etc, because I know we didn’t do any upgrades to our treatments. But we did order glasses of champagne and fruit, which cost extra.