Liszt’s Berceuse is a masterpiece of atmospheric color, using delicate arabesques and complex, layered textures. It is distinctive for its shimmering, virtuosic ornamental figures that surround a simple cantabile theme.
The technical difficulty lies in achieving a 'velvet' touch while maintaining absolute independence between the complex right-hand embellishments and the slow, sustained melody.
Comparable difficulty and character — good candidates for what to learn next.
Berceuse (S.174) is rated Henle level 6 of 9 — advanced repertoire, roughly ABRSM grades 7–8. In the RCM system it corresponds to about level 10.
You should be comfortable at Henle level 6 — meaning you can already play level 5–6 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 (S.174) lasts about 6 minutes.
Berceuse (S.174) 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 Ave Maria (Die Glocken von Rom) by Franz Liszt, Ave Maria (The Bells of Rome) by Franz Liszt, Un sospiro by Franz Liszt — see the full similar-pieces list on this page.