The good: Apartment was in an excellent location, close to EVERYTHING and right in the heart of downtown Athens! Stella and Nikos also made it very easy for us. They arranged for taxi pickups both ways, were very responsive and checked in with us almost daily.
The not so bad: The cafes downstairs were loud, until 3 or 4 AM in the morning, but Nikos and Stella left everyone ear plugs. Also, one of the bedrooms adjoin, therefore, guests will have to walk through one bedroom to get to another, but there is plenty of space to sleep and that's really all you are there for, right?