We stayed 4 days at Mevlut's place and have very positive impression! The apartment is very new and clean, the view is gorgeous! Mevlut was super helpful with how to get to the place, local suggestions, etc. Few things to keep in mind if you are considering this place - there is no elevator and there are quite some steps, so you will have to carry you belongings both downstairs and upstairs. Also the street (Yeni Dünya) is very hilly, and there is no dedicated parking place, like a garage or reserved spot, so you need to find it yourself. It was never a problem for us, as there always was a spot on the neighboring street. Parking uphill / downhill is an interesting exercise! Driving on Yeni Dünya might be a challenge too, if you are not used to Istanbul - very narrow, traffic in all the directions. Check g00gle map street view to get an idea of how it looks.