Chomentowski's Op. 6 Berceuse is a rare example of salon music that incorporates slightly more complex embellishments and figurations than standard lullabies. It is distinguished by its refined, idiomatic piano writing reminiscent of Chopin’s nocturnes.
The player must integrate the ornamentation seamlessly into the lyrical line without disrupting the underlying cantabile flow.
Comparable difficulty and character — good candidates for what to learn next.
Berceuse (Op.6) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 8.
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 (Op.6) lasts about 5 minutes.
Berceuse (Op.6) 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 Rudolf Friml, Cathinka Polka Mazurka by Hans Christian Lumbye, Black Pearl by Mel Bonis — see the full similar-pieces list on this page.