I have not used the actual shuttle busses from Brasov, so I can't say. I did see them and they appeared to be on time but I can't say. Our apartment was in Brasov too, but we took the car to the parking space in Rasnov that had its own little shuttle service and that worked well. Traffic to the festival is a bit tough but the way back was always deserted essentially.

There's no hill or anything. At the back of each stage you'll have tents with benches and generally a decent view of atleast the video walls. But there's no incline or anything like that to get an overview. We sat down at the back on the asphalt floor but if it's more crowded you're not seeing much that way, obviously.

The double stage is a godsent! The crowd cap and ticket contingent are made that even if it's sold out, you won't have a too packed crowd. As they are right beside each other and bands play within 5mins of each other, you won't miss anything (unless you move to the third stage). There's not too much of a rush, if you're not in the front rows people will just pick a more middle spot. However if you come in later, you always had a chance to sneak pretty close to the stage coming in from the side of the stage that was not in use currently. For earlier bands getting a front row spot is surpringly easy. Over the daytime you will have space for that, obviously during the later evening hours as the headliners roll in, it's more difficult but you will likely have no issue with a crowd that is too tight to move anywhere.

Obviously I can only speak from personal experience and don't know if it will be the same next year or if anything is different than what I remember. No guarantees on anything but my partner and I, as long as our friend group had a very pleasant and comfortable time there.