Franz Schubert's '12 German Dances' (D. 420) are early examples of his skill in writing for popular dance forms. They are characterized by their graceful melodies, simple harmonies, and infectious rhythmic vitality.
Focus on maintaining a light, graceful touch and clear articulation to convey the dance character.
12 German Dances (D.420) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 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.
12 German Dances (D.420) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.