This flat was my home for a month while I was in Athens. Everything was ideal for a single traveller, and I would say perfect for a couple as well. The flat is excellently furnished and equipped with everything you need, good quality appliances, aircon which was a must in the summer heat and good WiFi if you need to work. You wouldn't expect a semi basement to be bright but the decor is so well thought out with light colours everywhere and good lighting that works perfectly. And E windows are mirrored so no one can look in from street level.
As others have pointed out, the bathroom is indeed a bit of a squeeze but still perfectly adequate and well equipped. Everything is modern and clean and the washing machine was super useful for my long stay.
Communication was very good and anything I needed was addressed super quickly and in a friendly manner. The location is also good for transport into the centre, which is also within walking distance under cooler weather conditions.
All in all my stay was really comfortable, easy and pleasant. I would highly recommend this place.