Emrah's place is a flat share that's right in the middle of all the action without being too noisy or busy. It's down a side street right off of Nevezade, with all its famous meze and raki bars. Very well located! I stayed on the ground floor, which is admittedly a bit dark but also so quiet. It's fine for a short stay, but for a longer stay, try to get one of the upper rooms. They're a bit noisier from nearby street traffic, but have a lot more light.
Emrah is a great host and gave lots of tips and was really great for tips for onward travel in Turkey. The building is very clean, and the top floor kitchen has lots of great light and really great coffee! Can't recommend it enough. I love Istanbul, and I'd love to come back to this flat.