We have spent ten days in Rowena and Thanasi's apartament and loved the experience! It is as quiet and cool as advertised: we barely used the A/C even though it was over 30 C in Athens and you don't hear the hustle and bustle of the busy front street.
It has all the ammenities you need, very clean and generally a good vibe, we felt very at home in it. Both me and my girlfriens had to work for part of my stay to finish a project and I can say it is suited for that as well: a nice desk and a good internet connection.
Thanasi was a great host: he responds quickly, gives you all the information needed, is flexible and his document full of local tips is a gold mine!