Schubert's D.459A, though incomplete, offers glimpses into his early compositional style with its clear melodic lines and balanced phrasing. These pieces exhibit the characteristic charm and directness of the Classical era.
Developing clean articulation and a graceful melodic line are key technical goals.
3 Klavierstücke (D.459A) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 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 3 Klavierstücke (D.459A) lasts about 8 minutes.
3 Klavierstücke (D.459A) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.