Boswell's Waltz is a parlor-style waltz reflecting the influence of Chopin and later salon composers. Its charm lies in the melodic sequence and traditional ternary form structure.
Use a subtle rubato to emphasize the melodic shape of the waltz phrases.
Comparable difficulty and character — good candidates for what to learn next.
Boswell's Waltz is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 3.
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 Boswell's Waltz lasts about 4 minutes.
Boswell's Waltz 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 Boswells Waltz by Edward Balthazar Bohuszewicz, Belle of the Ball by Leroy Anderson, Waltz in A minor by Frédéric Chopin — see the full similar-pieces list on this page.