Athens (Greece) is definitely not a bike friendly place. Some municipalities (suburbs) have built a few bike lanes which serve almost no purpose since they are not interconnected with other areas, and in most cases have very bad planning which makes them outright dangerous. Even the ones which are useful, are almost always over-run by parked cars.
Riding on the road is another matter since (thankfully) most drivers have little to no experience with cyclists and, for the moment, seem cautious leaving adequate space when overtaking, although very close passes are daily occurrences with taxis, school buses and public transport being the number one culprits.
Personally, I see little to no value in cycle lanes here because the width of the roads is already way below specs on 80% of the grid which cannot possible handle changes and lane reductions. Also adding to the problem is just plain bad driving etiquette with cars frequently driving between lanes (center over the painted lane divider). Because of this, IF bike lanes were to be introduced, they would have to be segregated which brings us back to the non-standard, smaller width of the roads.