This is a great property for someone who is looking for a budget stay near Istiklal street(2 mins walk). Taksim is 6-7 min walk and all the cafes and clubs are nearby.
The rooms are big and airy and comes with a small kitchenette. The host is very helpful.
Just one side note, they have appartments on as high as 4th floor, so ask them for the availability on lower floors beforehand.