Apartments are good but not perfect. I believe that they are value for money. There is number of advantages: 1. Very good conditions of facilities (comfortable beds, good bathroom, toaster, dishes and etc.); 2. Everyday cleaning (for such price that is really great); 3. Hosts will cook one breakfast for you; 4. Responsive host Hikmet.
Also we would like to point disadvantage: 1. District of apartments (shoes factories near apartments that generate noise and, sometimes, bad smells - first night was really bad due to strong smell of glue, but then this smell has gone; also there is a lot of rubbish in the street - a real problem of Istanbul).
At the same time location is good and you can get to seightseeings and port by foot.
Also visitors should know that terrace is not in the apartments and is 2 levels upper than the apartments are.