No need for a car. You can walk or take public transportation to everything that you will want to see. No need for the added expense.
Make sure to pick up some paprika and those cute, hand-embroidered muffin/roll holders at the Central Market Hall as souveniers! Or maybe some handpainted ceramics! It's also a great place for a quick lunch.
You'll love the Marriott there! Ask for a river view.