Hasan is a great host, he always response very fast, the small apartment has a good location, its very easy to get to the tram's or to the taksim / istikal street. The apartment is a little bit small for 2 persons, but as i said, Hasan is a great host, he is helping you instant , if you have any questions oder if you need help, for sim cards, istanbul cards or stuff like this.
Overall, 4/5 Stars.