I live nearby. Can recommend this parking. Right next to it you have bus stop - No. 106 will take you directly to the city centre (tickets to be bought in the bus, paid by card) get off on Dworzec Świebodzki stop. You can lave your car there in the day with no worries - many people come there to have a walk in the park. Don't leave your car by the shopping centre parking lot because it's paid.