If you want to visit all the main spots of Athens (Plaka, acropolis etc) by walk then this is the. best place to stay. Its very central and saves you money by buying public transport pass and also time as everything is walkable. Don't try to find for bit cheaper accommodation as it will cost you more when you add the transport cost and travelling time.
Cleo is a very nice host. She was very kind in receiving us very late night and also let us store our luggage after our check out.
The house is very cute and has the old retro look. You will have everything you need for your stay. (neat and clean)
Do not hesitate to ask her if you need anything, she is very helpful.
Without a doubt I would stay here next time.