This is a character piece by the Dutch-American composer Alba Rosa Viëtor. It is distinctive for its late-Romantic melodic sensibility and expressive, song-like phrasing.
At Henle 3 this is a late-beginner piece — comfortable hands-together playing is assumed, and musical shaping starts to matter. The main demands: a true singing tone, with the melody floating above the accompaniment; rubato that must breathe naturally without losing the pulse; and chord voicing — bringing out one note inside a handful of others.
Focus on maintaining a consistent singing tone while balancing the accompaniment with the primary melody.
Comparable difficulty and character — good candidates for what to learn next.
A level or two down with the same spirit — ideal if this piece is still out of reach.
Where this piece's skills lead: slightly harder works making similar technical demands.
Eileen's Refrain is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 4.
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 Eileen's Refrain lasts about 3 minutes.
Eileen's Refrain 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 Dialogue by Alba Rosa Viëtor, Billy's Prayer by Alba Rosa Viëtor, 'O sole mio by Eduardo Di Capua — see the full similar-pieces list on this page.