The location is great. The building itself is on a small hill (note that you will have to go through a small stair or ascent in order to get to the house, that was no issue for me but could be for someone).
You'll be living in a top-floor loft. Because of that the view from the balcony is amazing. The ceiling could be a little low if you're more than 6 feet tall, but that was not unexpected.
Small kitchen with all facilities required is provided. The Akropoli, Syntagma square, Olympeion and National Garden are within reach, 5 to 15 minutes on foot.
The only issue for me was the absence of private washing machine. but a common laundry for the house. I weren't the only one who's going to use it, so I had to wait and hope for the luck :-).