We were stay at Cumhur's place for 5 nights, the best thing for this home is its location, 5 min walk to Istiklal St. & Galata port, you can find everything that you need around the place, everything is available, such as supermarket, restaurant, bakery & bar, actually i can say one of the best locations for tourists.
Cumhur and his brother are very helpfull and they are always available for you and they will give you great tips for locations and istanbul.
There are 2 bars downstair and if you are young and if you like bar, its a good place for you but if you are with your family and you need a quiet place at nights this place is not good option for you.
WC and Shower works but they are old and need maintenance.