It's a nice little apartment. I lived in it for a month. One person is more than comfortable.
The description and photos match 100%. It can be a little noisy in the evening since the apartment is located above a bar (be sure to try the torn beef burger). But it didn't particularly bother me.
Very good location. Close to the subway, and to the main attractions.
Ergül is a great host. Very friendly, helped with tips about local places.