I really enjoyed the stay! Nicole's place is close to the city center and within walking distance of all the central locations, in case you like to walk. If you prefer the train, there is a station 5 minutes walk from the apartment. The neighborhood is safe.
The apartment is spacious and it has everything you need for a long stay. It feels very cozy! The kitchen is big and convenient for cooking. Just downstairs you'll find a couple of supermarkets and plenty of places to eat, including a world-class gyro (at Ta Karvouna). As someone who visits Athens frequently, I must admit that this was one of my best stays. In short, highly recommended! Ευχαριστώ παρά πολύ, Νικόλ!