We had a pleasant staying at Konstantinos apartment. We used it as a base since the main attractions of Athens were reachable at walking distance, and close the metro too. There are a couple of places to have breakfast round the corner, and that was good. Konstantinos is very kind, was easy to check in / check out at the apartment, communication was fast and effective, and he was so kind to store our luggage during the last day of our trip (we really appreciated that!). Highly recommend!