I recently had a short stay there and was quite happy. Hotel still feels like new, very friendly service, liked the modern room design. Nice lounge with great espresso, good breakfast. Bar was a bit disappointing though (closed early, and they didn't have most wines on their wine list).

My rate was around EUR 125 if I remember correctly - likely one of the cheapest for a Luxury Collection hotel in Europe. The Serbian economy doesn't seem to be doing so well at the moment, which may be part of the explanation...