We stay in this appartment for 3 weeks and that was perfect decision. Neigbourhood is so nice! Osmanbey metro station is 2 mins walk, and that aria is one of the best in Istanbul. You have a lot of cafees and restaurants around, also places for shoping.
Appartment is cosy and modern in same time. Its perfect for people who want home office also, there is a big table and very good wifi. Kichen is very good equipped. If you come during the winter, dont worry, heating is best ever! You can control temperature by yourself.
As Ozlem describe, there is no elevator, and appartment is at 5th flor. But that was not problem for us, except when we come with the suitcases. But it worth, because you bring suitcases only once, and enjoy all other time.
Ozlem is very kind lady and she was available via AirBnb app all the time for us :)