Johann Baptist Cramer's 3 Piano Sonatas Op. 11 are well-crafted Classical works that emphasize clarity, melodic elegance, and sound pianistic technique.
Developing a nimble finger technique and a clear, articulate touch are essential for these sonatas.
3 Piano Sonatas (Op.11) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 7.
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 3 Piano Sonatas (Op.11) lasts about 17 minutes.
3 Piano Sonatas (Op.11) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.