Adolf Gutmann, a student of Chopin, composed this Bolero with a salon-music aesthetic. It is distinct for its balanced, tuneful melody and traditional harmonic progression.
The challenge is achieving a balanced voicing where the melody sings over the patterned accompaniment.
Comparable difficulty and character — good candidates for what to learn next.
Bolero (Op.35) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 5.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 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 Bolero (Op.35) lasts about 4 minutes.
Bolero (Op.35) 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 Adolf Gutmann, Berceuse by Adolf Gutmann, Ballade by Adolf Gutmann — see the full similar-pieces list on this page.