This movement from one of Mozart's early sonatas is a graceful and charming example of Classical era writing. It features a beautifully shaped melody over a clear Alberti bass accompaniment, embodying elegance and balance.
Precise articulation and a light touch in the left hand are crucial for capturing the Classical style.
Andante in E-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 6.
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 Andante in E-flat Major lasts about 3 minutes.
Andante in E-flat Major is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.