Mehmet's place was clean, attractive, and had all needed amenities for the three night stay. The apartment was exactly how it was pictured.
The check-in would have been painless using the provided instructions, but Mehmet's friend next door came over to show how to get in and gave some helpful advice about how to get around. To get to major sightseeing locations in Sultanahmet took around 40 minutes by bus and tram. A ferry stop is also nearby. There were nice local restaurants, bakeries, and small markets on the same street as the apartment.
Note that the location was not in the touristic part of Balat with coffee shops and boutiques, but rather a more conservative area of Balat a few blocks away. I had no negative experiences staying here, but some may be hesitant to walk around the area later at night.