Leonida's place is a real gem. The flat is situated in a building on a quaint quiet street uphill in Kolonaki. The area is safe and there are nice coffee places nearby. A metro station (forgot the name) is nearby. The areas of Psyrri, Plaka and Monastiraki are just a short walk away.
The flat it self is modern with all appliances you could possibly need. The bed is comfortable and definitely big enough for two.
Leonidas was quick in his responses and the communication with him worked smoothless. Stefan who greeted us upon arrival was really friendly too.
All in all this is a superb place.