If you need a place to stay and you want quality at a good price, choose Anastasia's! Genuine 5 star experience! Plus it is super close to the metro, a supermarket and many restaurants and eateries.
It is very safe and Anastasia is an amazing host who was very helpful when we arrived really early. . Side point, even though they don't have Uber in Athens, you can use the Uber app for taxis. We did and it worked exactly the same. There was no down side to staying here. Absolutely highly recommended.