While the area looks a little sketchy upon first arriving, it's a two minute walk to a bustling square and we never felt unsafe. It is within walking distance of the tourist sites, public transportation, and great cafes/restaurants. We particularly enjoyed getting take out from the nearby taverna to enjoy for a quiet night in.
Our host waited for us until past midnight as our train was late and made the check-in extremely easy.
We found the apartment to be very spacious for two people and it had all of the implements needed to make simple meals in the kitchen.
Overall a good stay and a great value in Athens.