Also had a recent stay here and liked it a lot. Breakfast offering in the restaurant was extensive and the happy hour in the lounge in the evening had great food choices, enough for a real dinner.
Interestingly, I stayed at the Metropol the night before and without status, they upgraded me to a Junior Suite. Here at the Hilton Belgrade, as a diamond, I was upgraded to an Executive Room. The room was nice and spacious as the photos above so no complains.