Using public toilets in Istanbul can be quite different from what you are used to. Most public facilities are squat toilets rather than Western-style toilets, meaning you may have to squat over a hole in the floor rather than sit on a seat. It is also important to bring your own toilet paper as it is not always available. Some public toilets charge a small fee, usually around 1 Turkish lira. Note that public toilets are not always well maintained, so make sure they are clean before using them.