Of course, there are many reputable taxi drivers in Greece, and these days it's hard to get ripped off… but you always have to remain cautious. Some of the best advice that I can give you about taking taxis in Athens is knowing a bit about what is the normal price for your area and distance. I recommend that you ask waiters, Greek friends, or your hotel concierge about what should be expected for your trip. Before you start your ride, make sure that you ask about how much the trip will cost. And make sure that they turn the meter on at the start of your trip. In addition, I always check Google maps to make sure that the taxi driver is taking the fastest route.