Volkan is a great host. Our flight was delayed and we ended up reaching his place only at 1AM and Volkan was available to provide our taxi driver with directions as well as welcome us and show us around the apartment. The apartment itself is perfectly sized for 2. For a group of 4, it may be a little cramped but again it is not too bad. The proximity to Istiklal street makes it a perfect place to spend time in Istanbul. Given a chance, I would definitely stay in Volkan's place.