What area are you in? Compared to Seattle/Portland/San Diego prices, 40k euros seems cheap for a 1963 670sqft apt. A similar house in Tacoma would run 110k euros right now, and it is a terrible location.
It's in Kallithea, a generic south-European concrete-jungle urban center. Also, I'm not sure it's fair to compare property values between the US and Greece. The average person working on the private sector would be lucky if he made $10000/year at this point in time.
Perhaps property value is in line then if 40k euros is an inflated price, I think 110k euros in Tacoma is a price too high for that area myself, the average income down there is around 22k euros a year for a working person [1].
Dude, you can't even buy a crackerbox in Seattle for 300k euros anymore, a 500sqft apartment has gone from 270k euros to 400k euros in the past 2 years, and that is before the 4500 euros you'll pay to go to an "exclusive" wine tasting/auction to bid on the few units that are up for sale.