Johann Baptist Cramer's Op.29 sonatas are finely crafted pieces within the Classical tradition, characterized by their clarity of form and melodic grace. They offer opportunities for expressive playing and technical refinement.
Work on smooth transitions between melodic phrases and clean execution of accompanying figures.
3 Piano Sonatas (Op.29) is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
3 Piano Sonatas (Op.29) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.