This place is located 2 streets back from the main road, in an area with several other backpacker-type hotels in a ramshackle neighborhood. The room does appear larger in the pictures, but otherwise accurately described. However, it is in a convenient location down a steep hill from Taksim Square.
Murat (the host) is responsive and speaks good English, but be prepared for periodic power, water & internet outages if you stay for more than a few days, though they don't normally last long. What you get is essentially a 2.5-3 star hotel room, at a price that compares fairly to other properties in the area. It's perfect if you're in town for a few days and wish to be close to everything, as Taksim Square is the transportation hub for Istanbul, but not really suitable for a longer term stay.