We really enjoyed our stay! The apartment is central (we walked everything in the city except of Piraeus), very clean and simple, but equipped with everything you need (even a washing machine). We especially loved the balcony with the view on parts of the acropolis, once you lean a little forward. At the beginning the apartment was a little cold but we simply got by by using the heating function of the air condition. The street in front of the building is a little noisy, but not too much since the apartment is on the 7th floor, so by using earplugs you will be totally fine :)
Apart from that the check-in and the whole communication was really easy and nice. We always got quick responses and even got many sightseeing and restaurant suggestions.
All in all we had a great stay and would definitely come again! :)