MacDowell's output typically favors nature-inspired themes and lush, chromatic harmony. This work acts as a miniature soundscape, typical of his romantic American-Grieg style.
Achieving an even, singing tone in the upper register while coordinating the left hand's syncopated pulse is essential.
Comparable difficulty and character — good candidates for what to learn next.
Barcarolle (Op.44) is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 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 Barcarolle (Op.44) lasts about 3 minutes.
Barcarolle (Op.44) 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 Berceuse Op.57 by Frederic Chopin, Étude in E major, No. 3 by Frédéric Chopin, Intermezzo in A major, No. 2 by Johannes Brahms — see the full similar-pieces list on this page.