Leonidas was a very accommodating, helpful, and responsive host - including early check-in even under inconvenient circumstances, and late check-out based on our flight times; he also responded quickly to messages and answered all of our questions.
Regarding the apartment itself - the location is wonderful: walking-distance to tourist centers, but out-of-the-way enough to be quiet and private (silent at night!). We were there in the winter and the apartment was well-insulated and warm. However - the mattress left much to be desired, to say the least. Also, the apartment seemed to smell vaguely of cigarettes, including and especially the linens. Still, the apartment was cheap and a good value, and we had a good stay.