Melas Spa & Wellness
If you are staying in Sultanahmet, note first that Melas Spa & Wellness is not in the Old City. It is in the basement level (floor -2) of the Melas Hotels building in Gayrettepe, in the Beşiktaş district. The spa takes day guests and combines a hamam, a pool and a sauna with a massage menu that has listed prices. Booking is mandatory and goes through WhatsApp. It is open daily from 07:00 to 23:00, and Google shows 4.8 from 926 reviews.