Me and my cat stayed at Mahmut's place for 2 nights.
Mahout is a great host. I arrived Istanbul in early morning and he allowed me to leave my bags and he was flexible with check-in time.
His place is very clean and conveniently located at 15 minute walk to underground and ferry lines, 5 minute walk to metrobus.
He shared his cat's food and toilet with my cat and gave great advice for my cat's health. He has been very polite and helpful for the whole stay.
I definitely recommend his place.