This is a popular Neapolitan melody arranged for the piano, capturing the sunlit and passionate spirit of the Italian coast. It is highly idiomatic to the parlor music tradition of the era.
The primary challenge is maintaining the forward momentum of the 6/8 lilt while keeping the melody expressive.
Comparable difficulty and character — good candidates for what to learn next.
'A Napulitana 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 'A Napulitana lasts about 3 minutes.
'A Napulitana 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 retirata by Pasquale Mario Costa, 'O cunto d''a si' Ciento by Pasquale Mario Costa, Piano Sonata No. 16 in C major by Wolfgang Amadeus Mozart — see the full similar-pieces list on this page.