Johann Baptist Cramer's '2 Airs Ecossois from Sonatas', Op. 44, are Classical-era pieces featuring Scottish melodies adapted for piano. They are distinguished by their graceful melodies and idiomatic keyboard writing.
Develop a singing tone and sensitive phrasing to convey the folk character of the airs.
2 Airs Ecossois from Sonatas (Op.44) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 5.
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 2 Airs Ecossois from Sonatas (Op.44) lasts about 8 minutes.
2 Airs Ecossois from Sonatas (Op.44) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.