Schubert's 'An Mignon' (D. 161, Op. 19 No. 2) is a setting of Goethe's poem, capturing a wistful longing for an idealized homeland. Its charm lies in its tender melody and Schubert's characteristic harmonic shifts.
Developing a sensitive touch and expressive phrasing for the vocal melody is key.
An Mignon(Op.19 No.2) (D.161) is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
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 An Mignon(Op.19 No.2) (D.161) lasts about 3 minutes.
An Mignon(Op.19 No.2) (D.161) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.