Konstantinas place is very centrally located. It is a 4 minute walk from the Metro station and a 30 minute walk to the Acropolis. There are some good restaurants near by. The apartment is around 12 minute walk from the Archeological Museum.
We were a family of 3 with a baby. We did not have any trouble finding the place. Konstantina and her husband came out to receive us and helped us upto the apartment. Konstantina is very responsive and helped us with any questions within 5- 10 minutes. The area is a bit far away from the main attractions, so if you like walking this is a good place. else the hop on hop off bus or the metro stations are just a 4 minute walk.