Maria's house is big and well equipped. The location is nice too, even if the area can have not so good reputation, the neighborhood was more quite that I was expected.
And the welcome was just perfect, there were fresh cookies and cold water in the fridge. It's really easy to feel like home.
And it's located close to everything (shop, public transportation, nice restaurant...) so for people who want to discovered Athens, it's a really good place to stay.