The apartment is nice, spacious, well-equipped and generally clean. It's convenient for both short and long stays, certainly. A microwave would be a nice improvement but otherwise it's excellent.
The location is very convenient, a few minutes away from the ferry boat stop, from the bus stop, and from the waterfront -- 10 minutes away from Uskudar square by bus. We would shop for groceries there. The apartment is a few minutes away from several supermarkets, but you'd have to walk uphill, which isn't an issue except for potentially elderly people.
The neighborhood is nice, safe, and quiet. It's a residential neighborhood so not many food places around, but there are a few. Numerous options however were available in Uskudar Square.
Tufan was nice and responsive. The neighbor is the caretaker which gave us a sense of security in case we needed anything. She was very hospitable and gave us a plate of food the first night we were there :)