Kia (per) cee ́d

Hello dear ones, I’m thinking of buying a Kia (pro) cee ́d 1.4. Can you please share your experience with the car? What kind of shit do I have to reckon with? (I’ve already read that some people start whistling the car at high speed). How are you satisfied with the Start&Stop function? Is it okay when you’re standing in traffic jams? How about the consumption? (City and Überland) I already say many thanks for your numerous feedbacks!