In sum:
Pros: good communication with the host, good location (near Istiklal Caddesi but in a quiet street), the place is comfortable and the space is pretty.
Cons (but not serious, are just little flaws): the shower head is not much stable and the roof is not soundproof, you can hear everything is happening in the upper room.
But is a very cool place, everything in the room worked well and is a very good choice.