Kostas' place could not be more perfectly situated in the centre of Athens - a neighbourhood with great character and access to bars, restaurants and other stuff one might need.
Kostas a great host and responded quickly to any queries. I'd recommend this place for visitors. The only thing is that the place does not get much sunlight as it is situated on the ground floor next to a wall but it doesn't really matter if you are out and about discovering the city anyway.