I stayed at Ozde and Omer's place for 3 nights. I can start saying that the location really stands out. It is right in the back of Galata tower, and a short walking distance to Karakoy (metro, tram and ferry) where you can move to basically everywhere in the city. The view from their terrace is amazing! The place itself is cosy and well prepared to accommodate 4 people. During our stay we where welcomed by a friend of them (Özgür), who was very kind and hospitable, he was always checking if we needed something. Absolutely recommended