Pasquale Mario Costa's composition is a charming narrative work that uses a barcarolle-like flow to evoke a storytelling atmosphere. It is typical of the Neapolitan school of the era.
Coordinate the flowing arpeggiated accompaniment with the lyrical top voice.
Comparable difficulty and character — good candidates for what to learn next.
'O cunto d''a si' Ciento is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 5.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 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 cunto d''a si' Ciento lasts about 4 minutes.
'O cunto d''a si' Ciento 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 'A Napulitana by Pasquale Mario Costa, 'A retirata by Pasquale Mario Costa, Ballade by Henri Rosellen — see the full similar-pieces list on this page.