We really enjoyed our stay in Kostas apartment! The apartment itself is quite small and in the lower levels of the building, but cute and great value for money. The bathroom would be a challenge for taller/bigger people.
Don't let the graffiti and poor street lighting of the area put you off. This is Athens, lively & youthful! Close to so many great taverna's, Coffee shops and bars enjoyed more by locals than tourists. Should plan to catch buses or prepare for decent walks if you are wanting to see the sites and touristy areas.