Ludwig Keller's Barcarolle is a characteristic 19th-century educational work designed for student refinement. It utilizes basic arpeggiated patterns to convey the swaying motion of a gondola.
Work on achieving a seamless legato line in the right hand over the broken chord accompaniment.
Comparable difficulty and character — good candidates for what to learn next.
Barcarole is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 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 Barcarole lasts about 3 minutes.
Barcarole 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 Black Beauty by Duke Ellington, Albumblatt für Clara Schumann by Johannes Brahms, Bright Eyes by Florence Price — see the full similar-pieces list on this page.