A 5-star experience. Before even getting to the apartment, let me echo other reviewers in complimenting Toni and his team. They provide top-notch, professional service that is well above what one should expect from an Airbnb host. He set us up with airport transfers for our arrival even though we were not staying at his place until our departure day. He is by far the most responsive and accommodating host we have ever had in all our Airbnb travels. So if you are in Athens you can't go wrong at one of Toni's many places.
As to the apartment, it was modern, stylish and clean. It had small patios off two of the bedrooms and an expansive patio off the family room/kitchen. The kitchen is small but well appointed. The amenities are thoughtful with body wash/shampoo/conditioner provided for each guest, WiFi, restaurant recommendations, a Nespresso machine - even the dishwashing liquid was full and sponges looked brand new. The beds and linens were comfy and there is a washing machine also.
The apartment is less than a 5 minute walk to cafes, restaurants and bars and a 10-15 minute walk to many of the key sites (including the Acropolis). I would highly recommend this place for a stay in Athens and even more highly recommend Toni and his team!