I rented a car at Sixt. I booked a BMW 1er/ Audi A3 which was 320 € for 9 days. They tried to sell me a BMW 4er cabriolet for „only 79,00 € more per day, more than it would had cost if I had booked it straight from the beginning. So they looking for the stupid... Of course I declined, I´m anyway not a big fan of cars with missing roof.
So I got a relative new A3 TDI with navigation system, which was fine.