This piece is a characteristic Neapolitan salon work from the late 19th century. It captures the lighthearted melodic charm typical of Italian popular music transcribed for piano.
The main challenge is maintaining a light, dance-like articulation in the melody while keeping the accompaniment rhythmic.
Comparable difficulty and character — good candidates for what to learn next.
'O chiavino is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 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 'O chiavino lasts about 3 minutes.
'O chiavino 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 'O llariulà! by Giuseppe Chiarolanza, 'O 'i lloco 'o pazzo by Giuseppe Chiarolanza, 'A pazziella by Giuseppe Chiarolanza — see the full similar-pieces list on this page.