Caenis, Op. 101, is a late-Romantic character piece that reflects the dense, chromatic harmony characteristic of Hans Huber. It is noted for its lush, operatic melodic writing and complex inner-voice movement.
Mastering the independent voicing of the inner lines against the outer melodic arcs is essential.
Comparable difficulty and character — good candidates for what to learn next.
Caenis (Op.101) 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 Caenis (Op.101) lasts about 5 minutes.
Caenis (Op.101) 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 Liebestraum No. 3 in A-flat major by Franz Liszt, 16 Waltzes by Johannes Brahms, Intermezzo in A major, No. 2 by Johannes Brahms — see the full similar-pieces list on this page.