This is a short, tender song by Schubert, set to a poem by Mayrhofer. It is characterized by its simple, heartfelt melody and gentle accompaniment.
Focus on a singing tone and sensitive phrasing to convey the emotional depth.
An Rosa (D.315) 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 An Rosa (D.315) lasts about 3 minutes.
An Rosa (D.315) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.