Umut is a great host! I stayed with him for one month and I absolutely loved it. He responds quick and if you have any questions about Istanbul he answers it because he has a deep knowledge of the city. If you're lucky his mother Aynur will also be there during your stay. She is such a kind human being and I was spoiled by her great food. I miss my time with Umut and his family already and can only recommend this apartment!