Boëllmann, primarily known for his organ music, brings a refined sense of color to this piano berceuse. Its elegance is rooted in its economical use of ornamentation and structured melodic phrasing.
Mastering the control of the soft-pedal and touch to produce a 'cradle' effect is essential for this piece.
Comparable difficulty and character — good candidates for what to learn next.
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 3 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 Andante by Wolfgang Amadeus Mozart, Blau Veilchen by Richard Eilenberg, Berceuse by A. Simon — see the full similar-pieces list on this page.