The location should be 6 stars, not 5:)
The room is not too big, but it holds everything necessary to spend a great week in Istanbul: a bed with a high quality firm mattress, perfectly functioning AC, fast WiFi and functional kitchen. In the walking distance you can find a cafe for any taste, and the historic center is easily accessible by foot and transport.
The host is very friendly, and communication in English was not a problem at all!