Sorry to post such a simple question, but I don't know how to get from the Zagreb Airport to my hotel, the Hotel Dubrovnik. I've heard cabs can't get there, and with substantial luggage, I'm not sure about the trams. Also, when we are departing, we will have to be at the Zagreb Airport at 6:30AM. Will the trams (if that is what I have to use) be running that early? Are they reliable? Any answers to these questions would be much appreciated, thanks.