My family (2 adults, 2 children) and me stayed for 2 weeks in Eleni's apartment and it was perfect for us!
It was wonderful that the rooms offered us so many opportunities (private space for everybody, perfect table vor having breakfast/lunch etc, perfect table to play games, a screen to watch movies, washing machine, ...).
We personally enjoyed living in this exciting, busting but relaxed area with a lot of political and arty graffities and one good restaurant after the other.
You found everything one could need within walking distance and the metro also was only a 7 minutes walk away!
Someone who doesn't know Exarchia might have to know that streets are not neatly cleaned but the house itself was very proper and clean and also very secure!
We recommend it deeply!