Ha, I wanted to post a picture of Petrzalka too!!!
I did remember the name (with the accent thingy on the z!), as I stayed in one of those flats myself for about a week once. I wouldn't call it the ugliest place on earth though. OK, it's not pretty, but at the time I thought it looked really fascinating. I remember indeed taking a panorama of pictures from up where the castle is, looking down at the wide stretch of concrete blocks on the south bank of the river.
Wikipedia has a picture from that viewpoint. It's not the whole panorama of course but it gives an idea of what the view is like from the castle.
