Communication with Konstantinos was easy and he answered quickly every time. We didn't know much about Athens and where everything is but it turned out this place is in the PERFECT location, really. Restaurants and cafés literally next door, close to Syntagma Square and Monastiraki Square and easy walking distance from the major archeological sites. The street just behind is also the main shopping street.
Room was clean, seemed recent. Bed was comfortable and sheets were perfectly clean. A/C kept us alive in the crazy summer temperatures. I also simply loved the view from the balcony. You can sit and enjoy a beer or a glass of wine at night looking at the Acropolis in the distance, it's just awesome.
Would definitely re-book if we visit Athens again in the future.