The flat is new and decorated very well, with all the accessories you would need. It has one queen size bed in the bed room and a sofa bed in the living room. There's also another sofa. Everything is clean. The best thing about the flat is probably the roof space that has a jacuzzi with a perfect view of the Acropolis - I recommend a midnight jacuzzi session when the Acropolis is lit up beautifully.
The host is very good. He was sick the day we arrived, and had to send someone else to greet us. He was still checking on us by text.
In summary, nice location, nice flat, nice host.