The flat looks exactly like on the picture and is really nice. It is clean, nicely furnished and has absolutely everything you need. It has a very homey feeling!
The terrace could use a small table and chairs, especially in the sunny weather, it would be great to sit there for a bit ;)

The flat was completely quiet, which was really a top priority for us as we were traveling with our baby. It is located on a quiet street with limited car access, hence the quietness. A quick 5 minutes walk will take you to supermakets, restaurants, bakeries, and other cheap eats options. Well, pretty much all you need is 5 minutes away.
We did not find the neigbourhood itself particularly exciting nor inviting, but it was alright as the metro station is reachable in a 5-10 min walk. So is the metrobus station. The lively and very interesting Moda area is a 15-20 minutes walk only.

We cooked a lot, the only thing that wasn't there is a microwave, but it was no big deal really, as we used the stove, oven, kettle and toaster a lot.

We met Ümit only one time, when we arrived, and he explained to us the way to the different metro and bus stations, which was very useful.

I'd recommend this place without hesitation if you want to stay in Kadiköy!

Thanks Ümit :)