More pictures have been posted on JustDubrovnik (check out the link for the rest of the picture, shown below are just a few of them) showing some finishing decorations on the Hotel Belvedere set. I can say that this will doubtlessly be the set for the much anticipated scene for season 4. Well at least one of them that is, since season 4 will be filled to the brim with amazing scenes.
Also one pic off the Dulist.hr site showed an amazing shot of a great sword in the background.
If you want to read my initial thoughts on what this set would be used for check out my post here. Be warned though it includes major spoilers for season 4 and A Storm of Swords.