Hummel's writing is quintessential transition-era Classical style, bridging the gap between Mozart and the early Romantic virtuosi. It is defined by its pristine structural clarity and highly idiomatic, embellished melodic passages.
Focus on executing the classical ornaments with precise rhythmic integrity and a fluid, vocal quality.
Comparable difficulty and character — good candidates for what to learn next.
Andantino in A-flat major is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 5.
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 Andantino in A-flat major lasts about 4 minutes.
Andantino in A-flat major 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 Allegro by Johann Nepomuk Hummel, Assembly Waltz by Johann Nepomuk Hummel, Black Beauty by Duke Ellington — see the full similar-pieces list on this page.