Umut's place is such a great and cozy one. I felt home and everything was fantastic. The area is nearby anything from airport metro, sultanahmet, and marmaray metro. It is easy to reach the place and i am sure you will enjoy it.
Umut is a very gentleman and educated person. He has a wide experience in life and you will enjoy having a chat with him. Meanwhile, he respects my privacy and quiet time.
Definitely, i would stay at his place whenever i visited Istanbul.