This apartment deco and amenities are AMAZING and COSY! There is really nothing additional to say about his place to stay, the pictures and descriptions in the Airbnb are SO to the point.
There are washing machine, place to cook, a big screen with more than 60 channels, iron, safety box, cupboard, many electrical plug heads, and a "receptionist" concept because he (and his friends) are always available downstairs if you have any questions.
You wouldn't find a better host compared to Emin, and his friends. I have never experienced such a happy and localized stay before with Airbnb. They provided me tips to places to go and visit around Istanbul (after 4 days I've stayed at Sultanamet), and places to eat (boza, tantuni, seafood), and also showed me places where I can go running/hamami.
In terms of location, his place is only a 10-minute walk to Ishiklal streets, and a 5-minute walk to bus station, which has access to many buses that can bring you across to Sultamanet/Eminonu (Spice Market)/Vefa (Boza) in 10-15 minutes time. In the morning/evening, there is a spetacular sunrise/sunset view from the walk from his place to the bus station. There is also a 24-hour fruit shop where you can buy fruits/groceries.
With his honest and joyful witty character, you will not get bored having a tea with him. I definitely recommend this place to stay if you are looking for something local and cosy, and convenient.