We loved our stay in Athens. The apartment is ideally located-walkable to everywhere we wanted to go. While we did not take public transportation, opting for private transfer to and from airport, we would definitely use the metro next time.
The unit is small, but was comfortable for two of us. Four would be very cramped, I think. The kitchen is well stocked with a full sized fridge. We made good use of the washer/dryer combination and appreciated the iron and hair dryer. The unit was very clean.
The air conditioner units worked well to cool the apartment. And we appreciated the black out shades in the bedroom. There was a little bit of street noise the first night we were there—I would consider bringing earplugs if you are a very light sleeper. After the first night, I did not hear street noise. The bed is quite firm. Sheets and towels basic but clean.
Check in was done remotely but host sent detailed instructions which were perfect. He arranged the airport transfers as well. He was very responsive through Airbnb messaging.
I have no hesitation recommending this Airbnb apartment for a stay in Athens!!
P.S. we booked several food tours through Airbnb which we highly recommend. Do not miss trying the loukoumades just down the street—fabulous!!