I'm Turkish, born and raised in Istanbul, and i've been renting out apts.I'm always around Sultanahmet every day to help my guests with transfers to and from my apartments, check in/out, or with tours within istanbul, to Cappadocia, or anywhere in Turkey.
My travel agency office is centrally located near all my apartments and its a great place to meet up, get useful advice, drop off your luggage before check-in or after check-out, or help with anything you may need during your stay.
Its cute place, among the places you need to visit.
Its 5 minute walking to blue mousque, ahia sofia and trum station.
It was a good experiance and advicable to anyone want to stay in middle of old city of Istanbul.