This is a hidden gem in the huge amount of the airbnb listings in Istanbul. It's the first proper apartment (instead of hotel suites listed as apartments), privately owned, where my girlfriend and I could really feel at home. It is extremely good value for money, it is conveniently located, 20 minutes far from the airport, less than 10 minutes on foot from the metro, about 10 minutes from the marina, where you can take boats to Eminonu, Kadikoy and Yenikapi (much nicer and often faster than by metro/metrobus). There are also minibuses right next door.
The apartment is quite large, it has a proper kitchen, and it is in a very quiet area. We found it very clean, with nothing needed to be addressed to make our stay more comfortable.
Ilkin was friendly, always replied very quickly, and made sure we had no issues during the entire stay.
We definitely recommend staying here, and we look forward to our next visit.