We boarded through door L2, where we were greeted by two flight attendants (one of them was the sky nanny, which is a concept Air Serbia got from Etihad). They verified our boarding passes and pointed us left into the business class cabin. Since the economy cabin was right behind us and still empty, I snapped a picture of it on the way in. It looked pretty nice, and I especially loved the seat finishes.
Air Serbia has a single Airbus A330 aircraft, which they took over from Jet Airways (which is also an Etihad partner airline). The business class cabin consisted of a total of 18 seats in a herringbone configuration, so they were spread across six rows in a 1-1-1 configuration.
Ultimately I far prefer reverse herringbone seats to herringbone seats, since you’re facing the window rather than the aisle. However, I still like herringbone seats for the privacy they afford, and prefer them to standard forward facing seats.