This Ballade by the Polish virtuoso Aleksander Michałowski reflects the influence of Chopin's lyrical style. It is characterized by its song-like melodic lines set against delicate, flowing accompanimental figures.
The primary challenge is maintaining a seamless legato line while balancing the dense harmonic accompaniment.
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 8.
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 6 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 Berceuse No.2 by Aleksander Michałowski, Berceuse No.1 by Aleksander Michałowski, Berceuse by Aleksander Michałowski — see the full similar-pieces list on this page.