These particular sonatas from Cramer's Op.23 further develop his established style, offering accessible yet engaging musical material. They represent the typical balance of form and expression found in Classical keyboard sonatas.
Pay attention to dynamic contrasts and precise execution of scale passages.
3 Piano Sonatas(M.2.049-51) (Op.23) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6.
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.
3 Piano Sonatas(M.2.049-51) (Op.23) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.