Kerem's flat is just like on the pictures - or even better.
I stayed in Istanbul and the Cihangir/Beyoğlu area many times, but this was the spaciest and most "complete" place I ever had for this kind of money. Upon finding the right address, the building's first impression might be a bit odd, but the flat itself is really spacious, clean and secure. It's really close to Istiklal, which means you are close to where the citylife happens, but the sound proofing of the windows is impressive. Quite the insomniac, I actually had no trouble sleeping here at all!
Kerem himself is really responsive to messages and called me right away when I mentioned I was trying to sort out the air-conditioning, and when I left contacted me as soon as I turned out to have a forgotten something, so I could go back and collect it. All in all, definitely recommended!