Okay, to begin with, the pictures on the website have nothing to do with reality. The room was at least clean, but the standard much lower than what the pictures are showing.
The owner was very difficult to reach and did not respond to written messages despite several attempts.
The appartment is difficult to access in the evening when the nearby shops (that use the same entrance) are closed, because the front door to the building is locked and you need a code to get in, which is impossible to get when the owner is hard to reach. Phone call is the only way to get in touch, but it takes several attempts to reach them. The written messages on my way appartment, were never responded despite several attempts hours before the check-in.
I wouldn't recomend anyone visiting Athens, to go and live here.