Autonom in central Cluj-Napoca has excellent car rental rates, starting at 155 lei per day. Cluj airport has several car rental agencies.
Trolleybuses 4 and 9 run from the train station into town while numbers 5 and 8 reach the airport. At research time a two-ride ticket cost 4 lei. Buy tickets from kiosks or machines near bus stops and stamp them in the machines when you board.
Rides between central Cluj and the train station or airport should cost roughly 12 lei and 25 lei respectively.
Unfortunately overcharging and other taxi scams are increasingly common among a few rogue taxi drivers, especially from the airport. One common wheeze is presenting two receipts (the taxi fare, and an unrelated parking ticket or 'city tax') and demanding payment for both. Keep luggage with you on the back seat, demand the meter be switched on when you enter a cab, and scrutinise receipts carefully.