Louis Lavater's '3 Waltz Impressions' are charming, short pieces that offer a glimpse into a Romantic harmonic language. They are characterized by their delicate melodic lines and light, graceful accompaniment.
Focus on creating a clear, singing melody over a flowing accompaniment.
3 Waltz Impressions 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.
3 Waltz Impressions is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.