Me, my wife and my mother stayed in Isik apartment for few nights, i didn't noticed that Studio is in fifth floor without lift, it was hard to climbing all the stairs but Fortunately Isik was more than helpful.
We had a lots of heavy luggage and he and his brother took the responsibility of that.
Apartment is in great location just few steps to Taksim Square and you are close to everything you need!.
Apartment is old but clean and fully Equip.
Hot water and A/C is great. The only thing you maybe need is water pressure.