This is a standard salon-style waltz characteristic of 19th-century parlor music. Its charm lies in the traditional harmonic progressions and predictable rhythmic lilt common to the genre.
Maintain a steady pulse in the left hand while bringing out the melody with expressive articulation.
Comparable difficulty and character — good candidates for what to learn next.
Catharinen-Walzer (Op.90) 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 (Op.90) lasts about 3 minutes.
Catharinen-Walzer (Op.90) 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.