I booked a car the night before for pickup the next morning. Initially, I was worried that in Europe, you couldn't get a car without booking at least a week in advance, but it turns out I was overthinking. The car was almost brand new, with just over 3,000 kilometers on it and purchased about six months ago. The service staff didn’t charge any additional fees, including for cross-border driving. SIXT, for example, charges 15 euros per day for that, but here it was completely free. There was no mileage limit for the car, and the whole process was worry-free. I paid a 300-euro deposit.