Just an update after the trip, went to The Prime after calling to book for the next day. Easy, no waiting time and masseur seemed a little stern but skill was great. felt totally relaxed though the walls did not go all the way up so I could hear the next door customer snoring half way through.
common shower on my floor. The next day I went back again and chose another masseur, different technique but similar greatness, this time with ensuite shower. Masseur seemed a little more relaxed than yesterday's one and smiled/chatted a little more.