This nice apartment is part of a newly renovated building in a somewhat distant but very very nice neighbourhood of Balat (it is part of Old but yet less touristic Istanbul which we liked a lot). You can reach Sultanahmet in 25 minutes by public transportation, once we made it on foot in a one hour walk through Balat, Fener and Eminönü. There is a ferry station in Balat also and you can take a ferry trip to Karaköy which is quite convenient, fast and overall nice way of transportation (and cheap btw as it is part of city transport and accessed with Istanbulkart just as metro, tram or bus). We've only met hosts briefly but they were always in touch via messages and they were really helpful and welcoming. So we can only recommend this place.