Viggo Brodersen was a Danish composer whose output reflects a blend of Scandinavian and Continental European Romantic sensibilities. This Ballade is an evocative, smaller-scale work that favors melody over excessive bravura.
Focus on the delicate balance of layered textures to keep the melody prominent throughout.
Comparable difficulty and character — good candidates for what to learn next.
Ballade (Op.30) is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Ballade (Op.30) lasts about 5 minutes.
Ballade (Op.30) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Nocturne in B major, No. 1 by Frédéric Chopin, Barcarole No.3; Op.50 No.3 by Anton Rubinstein, Bossa Nova by Serban Nichifor — see the full similar-pieces list on this page.