It's a beautiful building, a beautiful auditorium, and generally a good way to spend an evening in Belgrade. I won't say that the performances and voices are outstanding (I listened to Bizet's opera The Pearl Fishers), but in any case, I had a great time. I recommend you to visit
I watched two performances - Giselle and Swan Lake. The performers of both the main parts and the corps de ballet made a very big impression. In the stalls of the 7th row, all the emotions of the dancers are visible and this enhances the effect of immersion in the content. The costumes are very rich and the scenery is very good. The theater is small (I compare it with the Big One in Moscow), the building needs to be improved. The chairs are comfortable and the ceilings and mirrors are stunning. The prices are more than affordable. I highly recommend visiting.
The theater is small, but cozy.
The prices are affordable, you can buy e-tickets on the website.
We went to the opera Aida, a very bright production, there are subtitles in Serbian.