This piece is a light, dance-like work typical of the late Romantic salon tradition. It features a straightforward melodic structure supported by a characteristic waltz accompaniment.
Focus on balancing the accompaniment so it does not overpower the melodic line.
Comparable difficulty and character — good candidates for what to learn next.
Catharinen-Walzer is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 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 Catharinen-Walzer lasts about 3 minutes.
Catharinen-Walzer is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Catharinen-Walzer by Wilhelm Kühner, Belle of the Ball by Leroy Anderson, Waltz in A minor by Frédéric Chopin — see the full similar-pieces list on this page.