This is the same piece as D.346 by Franz Schubert, a movement from his larger works, celebrated for its effervescent energy and memorable melodic material. It is a cornerstone of the Classical piano repertoire.
Achieving crisp articulation and agile fingerwork in the rapid scalar passages is paramount.
Allegretto in C major (D.346) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 8.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 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 Allegretto in C major (D.346) lasts about 4 minutes.
Allegretto in C major (D.346) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.