Op. 29 is a lyrical work that draws heavily on the tradition of the late-romantic character piece. It displays sophisticated harmonic shifts within a traditional waltz-like structure.
The performer must master subtle rubato to breathe life into the melody while keeping the underlying structure steady.
Comparable difficulty and character — good candidates for what to learn next.
Bonne amie (Op.29) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
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 Bonne amie (Op.29) lasts about 4 minutes.
Bonne amie (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 Für Elise by Ludwig van Beethoven, Aus Meiner Kindheit by Sergei Eduardovich Bortkiewicz, 'A primma vota! by Ernesto De Curtis — see the full similar-pieces list on this page.