We absolutely recommend Giannis' place! We liked it so much that we booked a second stay. The view is to die for! We don't think there is an Airbnb with a better view of the Acropolis, Lycabettus hill etc. in all Athens! There are three different outdoor terraces, each with their own charm and perspective - you can enjoy the sun at any moment of the day.
The wifi is strong and works very well outside the house as well. The house is nice and cozy. Giannis was a wonderful host - very welcoming, responsive and accommodating!
We would definitely return!