Really had an nice stay in this apartment. The location was perfect for me. Lots of bars and restaurants around. You can take easily the ferry, train or bus to discover Istanbul. Also the size of the apartment is for two people perfect.
What I really loved was the balcony =)
The only thing what didnt work so good was the wifi. But in general its better you buy an turkish simcard ;)
So all in all i can recommend this apartment and for sure i will book it again.