This piece is a characteristic example of Brazilian salon music from the early 20th century. It features a straightforward melodic structure typical of the era's light classical repertoire.
Focus on balancing the melody against the accompaniment to achieve a clear singing tone.
Comparable difficulty and character — good candidates for what to learn next.
Amor de príncipe 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 Amor de príncipe lasts about 3 minutes.
Amor de príncipe 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 Black Beauty by Duke Ellington, Berceuse by Rudolf Friml, Albumblatt by Moritz Moszkowski — see the full similar-pieces list on this page.