The 'Boston' was a specific style of slow, gliding waltz that became incredibly popular in the early 20th century. Roderich Bass's piece captures the languid, ballroom aesthetic of the era with a focus on melodic simplicity.
Focus on a smooth, legato touch to emulate the gliding nature of the Boston dance step.
Comparable difficulty and character — good candidates for what to learn next.
Boston 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 Boston lasts about 3 minutes.
Boston 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 Believe Me, If All those Endearing Young Charms by Irish Folk Music, Valse sentimentale, No. 6 by Pyotr Tchaikovsky, Canson pel cabalet by Déodat de Séverac — see the full similar-pieces list on this page.