My flat is located in Papagos, one of the most well kept, safe and close to the city center (15' away) suburbs of Athens. It's only a 15' / 17' walk away from the Ethniki Amuna subway station.(Also: Uber will cost you 7 euros to the city center).
Please note that the architect of the building has chosen to only have curtains in the living room and not blinds, so it does get light in the morning, if someone sleeps on the sofa. Ideally the flat is for two people, but it’s up to you!
Smoking is allowed, but only on the balcony :)