Mozart's "2 Waltzes" (K. 144, K. 334) are delightful examples of his effortless grace and clarity in simpler forms. They are characterized by their charming melodies, balanced phrasing, and clear harmonic progressions.
Pay close attention to precise articulation and a light, elegant touch to capture the classical spirit.
2 Waltzes is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
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 2 Waltzes lasts about 6 minutes.
2 Waltzes is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.