A charming and simple lullaby written for students, typical of the 19th-century domestic piano repertoire. Its simplicity relies on the player's ability to shape a singing melodic line over a basic accompaniment.
Work on achieving a warm, sustained cantabile tone in the right hand.
Comparable difficulty and character — good candidates for what to learn next.
Buona notte (Op.11) is rated Henle level 2 of 9 — beginner repertoire, roughly ABRSM grades 2–3. In the RCM system it corresponds to about level 2.
You should be comfortable at Henle level 2 — meaning you can already play level 1–2 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 Buona notte (Op.11) lasts about 3 minutes.
Buona notte (Op.11) 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 Blaue Aeuglein by Friedrich Burgmüller, Berceuse by Arthur Letondal, Für Elise by Ludwig van Beethoven — see the full similar-pieces list on this page.