Also like others mentioned, if you plan to drive only mainly in the major cities, I would not rent a car. public transportation in Europe is amazing. Here in Krakow with constructions and congestion, I can get on a tram from my apartment to the town center in about 7min, with a tram every 5min. Car wise would take 20-25min, not counting time spent looking to park and the parking fees (which can get pricy)