The apartment is just as stated in the description and as shown in the pictures - it is a small studio at basement level, that feels like a ferry cabin, since the space is strategically exploited. If you plan only to sleep, eat and shower there, while really exploring Athens, it is the perfect spot for you: it is equipped with everything you may need, it is strategically located to the underground station of Syntagma/airport connection/all the sightseeing locations - you can reach everything on foot. Check-in procedures and apartment's specifications are very well explained, Nasos checks on you regularly and provides you with several suggestions on what to see and where to eat.
If I'll ever come back to Athens, I'll stop there again.