Esra's place is perfect for exploring Istanbul. In the heart of Galata, near the Eminonu harbor, it makes a great homebase to get to most of the European side of the city. Galata tower also serves as a great waypoint for cabs to drop you off.
The space itself is wonderful, and you feel like you're in a restored piece of history - outstanding view of the city, bridge, and several of the major mosques.
I would definitely stay again!