It's an Ok place to stay as long as you don't expect too much.
Sertac is a great host, though I haven't met him and communicated through messaging only.
The place is rather easy to find, especially thanks to Sertac's detailed instructions.
However, when you enter, you'll find that pictures are heavily Photoshoped, I literally didn't recognize the place for first minute and thought that there is a mistake, but it wasn't. Difference with pictures is quite big, the apartment is pretty dark (windows closely face another building), not closely as cozy as it looks on nice pictures. It is also much smaller than it looks in pictures.
I can't say it is particularly dirty, but surely can be cleaned better, especially bathroom. Towels have stains, there were hairs on walls and floor of the bathroom, the vent is covered with dust. I'm not very picky, so it was manageable for me, but I'm sure my girlfriend would've declined to stay here if she would have traveled with me.
There is only one light in the room and to turn it off you have to walk to bathroom door, not great at night. The tv is so small that you can't really see it from the bed, I couldn't find a single English channel or Netflix.
There are couple of restaurants and small shops nearby (highly recommend baran place), some tourist attractions and bars (so it does get loud at night thanks to passing by cars), but I have spent most of my time on southern part of the City, so had to walk quite a lot.
I didn't get a very good sleep, as it is quite noisy, cars with loud music pass by during night, neighbour's doors can he heard very clearly, so I did wake up several times (though I sleep rather deeply).
All in all, it's a decent place to stay as long as you don't have high expectations. Would've I stayed here again? Probably not.