Brandts Buys's Op. 29 is a set of charming Romantic pieces, likely intended for pedagogical or domestic use. They feature lyrical melodies and accessible textures.
Focus on creating a singing tone and achieving a smooth legato through sensitive pedaling.
3 Klavierstücke (Op.29) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 5.
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 Klavierstücke (Op.29) lasts about 9 minutes.
3 Klavierstücke (Op.29) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.