The apartment is a first-floor, very modern, large studio. It is located in Koukaki, which is a really cool area with bars and restaurants (and the modern art museum), close enough to the main tourist sites of Athens to be convenient. As it is on a busy road, maybe not ideal for light sleepers, even with the very thick windows.
Stelios and Sandy are extremely communicative and provide all the necessary information, airport transfers if needed, etc.