Great place to stay in the Kadikoy neighborhood, with many nice cafes in the neighborhood to hangout in. If you're staying longer term in Istanbul, I certainly recommend this liberal and hip neighborhood with great restaurants and bars, and less tourists. Easy walk to the ferry, metro and busses from Mustafa's place.
Mustafa was kind and always checking in to make sure things were good. Solid communication. The bathroom was always clean and the room is a decent size. Great value for the money. Recommend.