It was one of the tidiest, most comfortable apartman I've ever been to. It was also well equipped and the location was perfect, we could discover the most relevant parts of Athens easily from there. The view from the balcony was amazing, you can see the Acropolis from there :)
There's only one thing I can mention as negative experience and it was the noise from the main road next to the apartman. During the evening we could not sleep that well even with closed windows :( But I know it's hard to do something with it...
Overall I will definitely recommend the apartman for anyone who plan to visit Athens in the future :)
I also appreciate the recommended restaurants and places to visit, it was really helpful for a first-timer in Athens! :)