Very well located apartment with a well stocked kitchen! Loved the Nespresso coffee machine :)
It's within walking distance to the Acropolis and the metro is just around the corner. Most of what you would want to see in Athens is within walking distance actually.
Leonides was very efficient and took care of everything immediately, like arranging a taxi etc. All mails were answered promptly by him. Highly recommended! If there is any downside it is that the bathroom and apartment was slightly small, but that is to be expected in the centre of town. Don't let that stop you though, just something to be aware of.