This piece is a salon work typical of the late Neapolitan song tradition transcribed for piano. It is distinctive for its flowing, vocal-style melody that emphasizes cantabile phrasing.
The primary challenge is maintaining a singing tone while balancing the simple harmonic accompaniment.
Comparable difficulty and character — good candidates for what to learn next.
'A gallaria nova is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 3.
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 gallaria nova lasts about 3 minutes.
'A gallaria nova 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 Belle of the Ball by Leroy Anderson, Black Beauty by Duke Ellington, American Beauty by Joseph Francis Lamb — see the full similar-pieces list on this page.