Yes it is, do not post it anywhere, the fact of the matter is the fee and the services are between you and the provider.
When I write a review, I write about the spa, the providers looks, attitude, attention to service and probably the massage skills. After that, it becomes very blurry because I personally am only telling other if I enjoyed our time together or not. If one knows the spa and the provider, they will have a decent idea what I am talking about. If there is someone new who wants more information, I just tell them to go and find out if they personally like it.