Charles Lecocq, best known for his operettas, captures a light, lyrical quality in this Berceuse. The work displays idiomatic keyboard writing that favors expressive cantabile playing.
The ornamentation must be executed with grace and rhythmic flexibility, not as a mechanical exercise.
Berceuse 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 Berceuse lasts about 4 minutes.
Berceuse is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.