Józef Wieniawski composed this piece with a deeper harmonic palette than typical salon works. It utilizes a more expressive, idiomatic piano writing style.
The technical challenge involves the sustain and layering of thick harmonic textures while keeping the melody singing.
Comparable difficulty and character — good candidates for what to learn next.
Barcarolle (op.29) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 8.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 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 Barcarolle (op.29) lasts about 5 minutes.
Barcarolle (op.29) 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 Ballade by Józef Wieniawski, Barcarolle-Caprice by Józef Wieniawski, Balada mexicana by Manuel Ponce — see the full similar-pieces list on this page.