Firat was an amazing host. Super kind, super fast in responding to questions. He also prepared a welcome package with crackers and Turkish wine. Definetely 5 stars for that. Also this apartment is a great value for money (we paid roughly 50 Euro per night).
For an overall 5 star experience the apartment - in our opinion - should improve on comfort (especially beds) and cleanliness (it was definitely clean enough; however, we found some missed spots here and there).
Also, this apartment is located in the middle of Istanbul, in a cloud of 24/7 car noises and Kebab aroma:-).