This piece uses the common tropes of departure music with a steady, walking bass line and a soaring melancholic melody. Its charm lies in the simplicity of its harmonic language and sentimental character.
Achieving a smooth, flowing legato in the right hand is essential for this piece.
Comparable difficulty and character — good candidates for what to learn next.
'A partenza d''e marenare 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 partenza d''e marenare lasts about 3 minutes.
'A partenza d''e marenare 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 cocco fresco by Carlo Fanti, 'O garibaldino by Carlo Fanti, Waltz in A minor by Frédéric Chopin — see the full similar-pieces list on this page.