Have just returned from a wonderful 7 night stay in Istanbul and decided to try the Cemberlitas Hamam and paid 60TL for 'the works' - 15 minute foam massage and the 30 minute oil massage.
My experience was not a very good one - while the architecture of the building is beautiful and dates back hundreds of years, the indifferent service spoilt my enjoyment of the experience. It was very busy when (6p.m.) I went, so maybe they were pushed for time, but I did not get the 15 minute foam massage as advertised - it was a cursory rub down and then I had to wait for what seemed like over an hour for the oil massage in the adjoining room. There were about 8 of us waiting and many of the ladies were complaining - one left! and when I did get my massage, it certainly was not 30 minutes. I felt very let lown by my experience and would not rate it as one of the highlights of my trip.