This apartment is extremely well located, few meters from the metro (straight from the airport), hundred meters from every touristic places.
The neighborhood is great.
Lot of markets, restaurants, bars, coffee shops.
Nevertheless the appartement equipments are decent, few things weren't working (fridge not pluggable because of a too short cable, left bed light dead), not a single small piece of soap, no toilet paper.
Appartement door is no well isolated, you may hear your neighbors easily.
At the end our stay was enjoyable, Athens is an awesome city. And with some small attention to the details from our host, our stay would have been too ranked.