This place was nice on the inside. The beds were pretty comfortable and the wifi worked fast. The bathroom was rather typical for Athens (no flushing of the toilet paper, waiting 10-15 for the hot water for a share, etc.). The kitchen was fairly well equipped for cooking. The host was extremely friendly and accommodate our last-minute request (around 20:00), which was greatly appreciated. There is also self-check in, which I always prefer.
The only downside is that it is located in the Omonia area, about 2 stations from Syntagma square. The Omonia area is one of the worst in Athens and while we didn't have any problems there are definitely plenty of dubious individuals in that section of town and I would definitely NOT recommend single travelers (especially female) from staying in this area.
Overall, not a terrible value for your money and if you're alert and travelling with another person you should be fine.