Raven is a super lovely place in Istanbul: the apartments are simply awesome and stylish, with a lot of space and very clean. The area is great: it's the very centre of the city, shopping and nightlife are everywhere around. Many restaurants, pubs and cafè to enjoy!
Serap is a great host, always willing to help you out and give precious advices on places to visit, activities to do etc. There is a pub on the ground floor managed by some awesome guys with whom we spent great time. I highly recommend Raven to anybody willing to enjoy Istanbul and its nightlife!