Speidel's contribution to the genre is marked by the structured, balanced phrasing typical of late German Romantic teaching pieces. It requires a delicate touch to sustain interest through its standard harmonic progressions.
Pay close attention to finger-legato in the inner voices to keep the texture clean.
Comparable difficulty and character — good candidates for what to learn next.
Barcarole is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
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 Barcarole lasts about 3 minutes.
Barcarole 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 Belle of the Ball by Leroy Anderson, American Beauty by Joseph Francis Lamb, Allegretto and Mazurka by Frédéric Chopin — see the full similar-pieces list on this page.