Nikos' place is located very close to the best ancient sights that Athens has to offer, with a great view of the Parthenon. It's in walking distance from the centre as well. He is a very good host and was interested in us having a good time both in the city and at the flat.
The apartment is clean, spacious and with good amenities, so it was easy to relax after a full day of sightseeing and travelling.