We had a nice stay in Vefa's studio, the place is cute, smaller than we expected, but still it had a nice modern touch. The check in and check out process was easy, and the host's instructions were clear. Located in a nice neighborhood close to famous streets but still very calm and private.
the downside was when we requested new clean towels they wanted to charge us extra in euro, and they wouldn't let us keep our luggage after check out (since we still had a full day in Istanbul) but luckily we found another hotel who stored them for us