Artur Lemba, an Estonian composer, brings a distinctively Nordic melancholic lyricism to this Berceuse. The piece is notable for its lush, extended harmonies and broad, expansive phrasing.
The technical hurdle is managing the wide-spanned chords while maintaining a soft, consistent cantabile touch.
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 5 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 Berceuse héroïque by Claude Debussy, Piano Sonata No. 14 'Moonlight', No. 2 by Ludwig van Beethoven, 'Abegg' Variations Op.1 by Robert Schumann — see the full similar-pieces list on this page.