The place is very central and functional. The two main flaws are:
1) It feels like nobody ever actually lived in it. It was redesigned and renovated to be an Airbnb place, and it shows. There were important things missing in the kitchen, I found only one large pot and one small frying pan. As I was going to spend 10 days there, I bought some pieces of cookware, incl. a small pot to boil water (there is no kettle), plus paper towel, tin foil etc.. Also, no tea towels (I used a bath towel). In the shower there are no shelves for shampoo etc. I know these are small details, but it is what makes you feel at home in an Airbnb place.
2) The location, though unbeatable in terms of centrality, was also a big problem at night, as it is smack in the centre of the hub of night life in Athens. Starting after midnight, and going on even to 4 or 5 am in the weekends, I was woken up by people yelling, singing out loud, playing music, laughing, smashing bottles etc. Being on the third floor, you could hear all this as if it was right outside your window. Besides, even on nights that were not particularly hot, I had to use the a/c because I did not want to open the windows due to the noise.
Stelios was very accurate and reliable. The place does not have a dishwasher, as I had read on the website, but it has a washing machine (although there are no tools for hanging your laundry). The "dining table" is very uncomfortable to sit at and not very stable. On the plus side, the bed was absolutely fantastic!