We decided to give a chance to this new flat on Airbnb and we weren't disappointed.
Communication was great from the very beginning: Alexandros always replied to our messages in minutes and even checked information on opening times or transportation from us, found us nice places for drinks and dinner and reserved a taxi for us (which is very useful when you don't understand modern Greek!). Oh and he was available for a very late check-in, despite not living in the area.
The flat (I'd call it an oversize studio flat) is very comfortable and has plenty of space, though I would only recommend using all its 6 beds to a family or a large party of friends, not to more couples.
Appliances are new and in perfect working order and there is all you would need to cook your own meals, weren't it so close to as many nice restaurants and taverns as you can imagine.
Did I mention location? Here the description is faulty - only because there are no words to tell how close to everything this flat is. In the very heart of Plaka, seconds from shops (a grocery shop too, open until 11 pm) and tavernas, minutes from Anafiotika, the entrance to Acropolis and the temple of Zeus, within easy walking distance from anything one may want to visit in Athens and in excellent position for transportation, including car rentals; and yet you seldom hear a car engine, as this is a no-drive-through area.
Somehow Alexandros even contrieved to have sun and temperatures in the mid 20es (Celsius) upon our arrival, despite the terrible forecast.
We would definitely recommend this flat, and would use it again in case we go back to Athens.