Summarry: Depending on dates, it could range from extremely unpleasant experience to a decent one.
The details: This is unfortuantely the first time I write a negative review, after staying at tens of properties and hosting even further times.
The flat itself is decent as previous review note. Unfortunately we were unlucky to have a festival nightly on the square below which rended the entire stay in Athens hellish. The festival was from about 6pm-0.30am which meant sound testing started about 2pm to 3pm. The extreme loud sound penetrating the flat was exteremly uncomfortable to deal with and practically felt akin to being in a nightclub and sitting directly next to the speaker. Personally I'm not big in Techno and Hard Rock which featured extensively.
What made things worse is that arriving after long journey from Hong Kong after flight connection and jet lag, sleep was really needed and naturally be onset earlier than normal as well as waking up. The techno music was too much to bear an alternative accommodation was booked to allow recovery from flight and some sleep.
On the first day that started I contacted the host which is a firm. They did confirm this is a regular September event which they are aware of, alas never bothered to notify ahaed (despite booking made months ahead). Their general attitude was to invalidate the experience (pointing to irrelanvies such as 5 stars from previous guests or being patronising).
Bottom line is our Athens stay was hellish due to sleep depravation. Furher, had to fork out further cost to stay in alternative accommodation which owner wouldn't reimburse. I'd make sure to reserach local activities before booking the property because if you face a problem, well it's your own to resolve, owner made no allowances.
Final word about AirBnB as platform, the support team did their best to try and mediate the situation and it was greatly appericiated. Unfortunately though given platform policies they had little room to oporate in.