The apartment is nice and cozy, well suitable for short-term stays. There are bunch of nice cafes and shops nearby, and it's just about 20 minutes walk from Taksim square. However, the apartment has 2 major cons:
1. It is very dark inside, the light almost does not come from the window because of it's location.
2. It is absolutely NOT soundproof, so you get to hear every single noise coming from everywhere: neighbours, outside patio from another house, street, and etc. And people around are not the quiet ones. I had troubles sleeping because of this.
I would recommend it for short stays, the host is very polite and helping, but it is not the best choice for longer stays.