Juliusz Zarębski was a brilliant pupil of Liszt, and this work reflects his advanced harmonic and pianistic command. It is a highly sophisticated, expansive take on the barcarolle form.
The main challenge is the sustained voicing throughout the complex and active harmonic accompaniment.
Comparable difficulty and character — good candidates for what to learn next.
Barcarolle (Op.31) is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 9.
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 Barcarolle (Op.31) lasts about 6 minutes.
Barcarolle (Op.31) 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 by Juliusz Zarębski, Berceuse by Louis Moreau Gottschalk, Albumblatt by Aleksandr Glazunov — see the full similar-pieces list on this page.