Theodore Oesten's '2 Volksweisen' Op. 329 likely presents simplified, charming arrangements of folk melodies, popular in the Romantic era. These pieces would be characterized by their approachable melodies and graceful accompaniment.
Focus on a clear melodic line and a light, flowing accompaniment, emphasizing the waltz rhythm.
2 Volksweisen (Op.329) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 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.
A typical performance of 2 Volksweisen (Op.329) lasts about 5 minutes.
2 Volksweisen (Op.329) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.