We very much enjoyed our stay at Mehmetcan's place. The host helped us a lot and answered all our questions. The place itself is very well located, nice, bright and clean. Perfect fit for those who want to explore old parts of Istanbul. You can go to Galata through İstiklal or take a walk to Maçka park with Nişantaşı nearby or come down to Kabataş to hop on to ferry to Anatolian side of Istanbul.
All in all, highly recommend.