A great apartment, clean, great facilities and Eleni is there to greet you with tips for Athens and a map to the Acropolis and other places of interest.
It is only a 15 minute walk into Plaka from this area and we found some great restaurants and bars.
Exarchia Square (actually a triangle) is a little 'lively' at night with men selling drugs and approaching you to see if you are interested. We were only asked once, however it was a little intimidating and better to walk around the edge of the square than walk through the middle of it.
I would definitely stay again.