Site recommended by RS requires 3 nights. Only need two nights for two persons and close to the action. Need to take an early am train to Vienna, so close by would be nice. Any suggestions for aptmt., mid-Sept?
Rick's book lists these two hotels close to the Zagreb train station: www.hotelastoria.hr and www.hotel-central.hr. They are both large places, so it's hard to understand a 3-night minimum, unless there's a convention. If you can't book the dates you want online, try emailing them directly. Google Maps can also help you to identify other hotels (Best Western, Sheraton) and hostels near the train station.
I booked Hotel Central over the net for one night, no problem.
You had specifically asked for an apartment and when I rented an apartment in Zagreb, everyone wanted a three night minimum. In the end, I went ahead and paid for three nights but just told the owner I would leave after two. It was well within my budget do it this way and I ended up with an enormous apartment right off the main square. You can catch the street car to the train station from just around the corner and be there in about 5 minutes. We rented from InZagreb and rented their apartment called Apartment Gold. Total price for three nights was $200. www.inzagreb.com I really really liked Zagreb and am so glad we stopped there. It was an extraordinary bargain of a city.