Emmanuel Rhené-Baton's Op. 18 offers two evocative melodies from the French Romantic period. They are noted for their refined harmonies and tender, introspective moods.
The main challenge lies in achieving a delicate balance between the melodic line and the accompanying textures, with sensitive use of rubato.
2 Mélodies (Op.18) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 6.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 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 2 Mélodies (Op.18) lasts about 3.5 minutes.
2 Mélodies (Op.18) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.