Johann Baptist Cramer's Op.44 sonatas are characteristic of the Classical style, offering both musical substance and technical exercises. They are designed to develop proficiency in idiomatic keyboard playing.
Requires crisp articulation and control over dynamic nuances.
3 Piano Sonatas (Op.44) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7.
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 3 Piano Sonatas (Op.44) lasts about 15 minutes.
3 Piano Sonatas (Op.44) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.