Schubert's 'Antigone und Oedip' D.542 is a Ländler, a simple Austrian dance in triple meter, often lyrical and nostalgic in character. Its charm lies in its unpretentious melody and gentle rhythmic pulse.
Developing a nuanced understanding of rubato and a graceful waltz rhythm is key to capturing the piece's character.
Antigone und Oedip (D.542) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7.
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.
Antigone und Oedip (D.542) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.