The orange studio is the greatest place to stay in Istanbul! It's even prettier than the photos :) it's a 1 minute walk from the Osmanbey metro, which is 5-10 minutes from Sultanahmet (blue mosque, hagia sophia, topkapi palace, gülhane rose garden...). The neighbourhood itself is not touristic. The terrace is perfect. We stayed there four nights and will definitely come back on our next trip to Istanbul.
Fatih is a very kind and helpful host, and speaks very good english. He gave us several city guides and answered all our questions.