I stayed at Dodo's place with 5 friends during a long week-end in Istanbul. We absolutely loved the apartment which is located in a top area (Galata). It is well designed and decorated with taste and it also has very thing you need.
Dodo is a great host ; he recommended many nice places in the neighbourhood & he is very friendly & helpful. I would definitely recommend you to stay at Dodo's place during your stay in Istanbul. Thanks a lot Dodo :) !