The place is neither big, nor modern, nor very clean, nor very convenient.
Even though it is cheap, It is way too expensive for what it is. For 1 or 2 dollars more a night, you get something way better in Istanbul.
3 persons altogether live in this very small flat : One occupies the living room. The 3 persons live very close to each other. The rooms are not sound proof and at night you hear the very lively neighbourhood. One last point : 5th floor of very stiff stairs. And very old building. I don't think it's very earth quake resistant.