This mazurka is a piece of American salon literature modeled after the European dance form. It features the characteristic accent on the second beat and requires rhythmic flexibility to sound authentic.
Mastering the displacement of the beat is essential to capture the stylized folk-dance nature of the mazurka.
Comparable difficulty and character — good candidates for what to learn next.
By and By Mazurka (Op.70) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 5.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 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 By and By Mazurka (Op.70) lasts about 4 minutes.
By and By Mazurka (Op.70) 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 Bright Light Medley Quadrille by Edward Noble Catlin, Artist's Galop by Edward Noble Catlin, Waltz No. 2 by Dmitri Shostakovich — see the full similar-pieces list on this page.