We had a lovely stay in Konstantina's apartment. She really is a super host and helped us with everything that we needed. She even picked us up with the car at the Syntagma bus station and showed us around the neighborhood.
The apartment is very clean, modern and cozy and is very well equipped. There's a big TV with Netflix, beach towels and even a beach umbrella is available. The location is very good, you can easily reach all the attractions either on foot or by bus and there's a supermarket nearby. The area is also full of really nice restaurants and pubs (Konstantina will give you some good recommendations).
We definitely recommend Konstantina's place for staying in Athens!