İstanbul Spa Hamam (Ataköy)
For a first-time visitor based in Sultanahmet, this is a hamam you would travel out to rather than walk to: it is in Ataköy, Bakırköy, inside the Ramada Plaza by Wyndham Ataköy hotel. The menu goes beyond the hamam, with packages from €40 (hamam and scrub) to €120 (VIP programme) and around a dozen massage types, mostly €35–65. It is open every day from 11:00 to 23:00, so a late visit after a day of sightseeing is possible. Google shows 4.6 from 97 reviews. Whether men and women are separated, and whether you must book ahead, is not stated, so ask before you go.