André Mathieu was a child prodigy whose compositions bridge late Romanticism and 20th-century French styles. This piece utilizes lush, impressionistic harmonies to evoke a dreamlike state.
The player must manage wide-span arpeggios while maintaining a singing, legato tone in the melody.
Comparable difficulty and character — good candidates for what to learn next.
Berceuse is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 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.
Pieces at a comparable difficulty and character include Autumnal Sketch by Sergey Prokofiev, "Oh Woods("Oi giria, giria"), VL 276 by Mikalojus Konstantinas Čiurlionis, As estrelas by Oscar Lorenzo Fernández — see the full similar-pieces list on this page.