Nice flat, unfortunately the street is not too clean and can be loud late into the night. One morning we had no electricity for a few hours and another morning no water. However, it is very close to Taksim square, the water, the shops in Galata and public transportation. You should be prepared to climb 4 flights of stairs to the flat, as there was no elevator.
I would probably consider staying there again. Tje host was extremely approachable and very nice.