Yannis is a great host with a well located place. The apartment is minutes from Acropolis and it's metro station.
The first night we arrived we actually walked to Plaka. It is very close with many restaurants and shops.
The place itself is cozy, clean, modern. Note that the elevator is small, but works. Overall, we really enjoyed our stay. One thing to keep in mind is that the beds are quite firm. Other than that, nothing we could say could have been better.