My 1 week stay at Mehmet's place was absolutely wonderful. Despite miscommunication from my side, check-in was quick and easy. I was a solo traveler and the bright and airy studio, accurate to pictures and description, was the perfect size for 1, 2 maybe even 3 people. It's located on the rooftop on the 5th floor, so you walk an extra flight of stairs when you get off the elevator, just a heads up.. but that wasn't an issue. The set of keys you will receive upon arrival has a transportation card which is a cool perk!
The building is safe and secure in a really nice location, off Istiklal st, within walking distance from Galata tower and many nice cafes and restaurants as well as public transportation stops.
I wasn't sure how to work the washer located in the basement, but Mehmet was quick to respond with instructions (detergent is complimentary btw).
He was always available to answer any questions, and recommended a few bars, clubs and restaurants to go to. He even delivered Alka Seltzer and pain reliever the morning after a night out drinking!
I highly recommended his studio if you want a nice place to stay that's central yet quiet with an awesome host!
When I come back next year, I'll definitely stay there again.. and I think you should too :)