This is a charming and somewhat reflective piano piece by Mozart, a short song titled 'An die Hoffnung' (To Hope). It is notable for its gentle melody and simple, elegant accompaniment.
The main technical challenge lies in maintaining a smooth, lyrical line with sensitive pedaling.
An die Hoffnung (K.390) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 3.
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 An die Hoffnung (K.390) lasts about 3 minutes.
An die Hoffnung (K.390) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.