At IST, do not roam widely—choose one food stop or lounge and relocate early because the airport is enormous.
We recommend you stay airside: Istanbul Airport is very far from the city, making short exits unrealistic.
A brief city visit is possible only if traffic is light and timing is ideal.
Choose a historic or central neighborhood and enjoy wandering, food, and views. The city rewards slow exploration, but distances and traffic mean fewer stops work better than ambitious plans.