Barbaros's management of the building (multiple units, including this one) is very professional, and we had a great stay. The unit is conveniently located near the major attractions of the old city (Grand Bazaar and Blue Mosque), and they recently completed a remodel, including a totally new bathroom.
Hosts were very helpful at check-in, arranging pick-up from the airport and carrying some of our luggage up the stairs, and had good recommendations in the neighborhood.
Our only critique is that we ran out of hot water on the last day of our stay (we got a bit of a later start); otherwise, we recommend it completely.