Balat (https://goo.gl/maps/woazwJF8UUicRujR8) is one of the colorful neighborhoods in Sultanahmet.
Enter on Google maps and you will find the recommended buses to reach here.
The area has cute shops and restaurants and is extremely Instagrammable, so if you have a day off in Istanbul or still noting down what to see then do visit Balat.
The roads are very steep so watch your steps otherwise you will hurt yourself.