When you arrive at your destination you can rent a car or use one of the other modes of transportation like the train or bus. Renting a car though gives you the freedom to travel to places and stay as long as you like. You can also go off some of the side roads and see attractions that you cannot get too if you were using other modes of transportation. The biggest drawback with Europe rental cars is that they can be quite expensive and sometimes the language barrier can be formidable.
One of the best ways to find a rental car in Europe is to go through a travel agency or look online and use one of the car rental websites. There are many different ways in which you can get good rental rates while on vacation in Europe. If possible try to rent the car for several days, or even a week or more. Usually the per diem rates for car rental will decrease for a longer rental time.
You can also use a car rental consolidator who will check the prices from different rental companies and can find you a lower rate usually. Planning in advance will also get you a better rate than last minute rentals.