Louis Masson's Andante is a clear, instructional piece suited for developing musicians. Its modest technical demands allow for a focus on tonal clarity and phrasing.
Maintain steady rhythm and clear articulation in the right-hand melody.
Comparable difficulty and character — good candidates for what to learn next.
Andante is rated Henle level 2 of 9 — beginner repertoire, roughly ABRSM grades 2–3. In the RCM system it corresponds to about level 2.
You should be comfortable at Henle level 2 — meaning you can already play level 1–2 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 lasts about 2 minutes.
Andante is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Canción de Margarita by Louis Gobbaerts, Albumblatt by Salomon Jadassohn, Am Verlobungstag by Carl Gänschals — see the full similar-pieces list on this page.