The apartment is great and exactly as pictured on the ad. Very spacious and most items you would need are available. Only if you plan on cooking your own meal, keep in mind there's one pan for that. Besides that it has a comfy bed, nice living area and good bathroom. The area in which the apartment is situated is not very pretty, lots of graffiti all around and streets aren't very clean. There are some nice bars at Exarchion square to check out. Closest metro station Omonoia is 10-15 minutes walk.
Sevi, the owner was very flexible and good to communicate with. She let my friend stay longer on departure day as she had to wait for a late flight.
Overall, it's a good place to start exploring the rest of Athens from.