Hasan is a great guy, communication was perfect whenever we needed it.
The apartment is nice, clean and well equipped. It's just 2 minutes walk from a nice park with outside gym facilities and free WiFi. Through the park it's big shopping mall (Marmara forum) with everything you may need.
Unfortunately we forgot the keys inside one day, but a message to Hasan and he solved right away when he's brother come all the way from Eyub Sultan and delivered a key.
The main door has code lock which make everything easier and quietly.
I hope to come back to Istanbul and be able to rent from Hasan again.
I highly recommend Hasan's apartment.