Charles Gounod, primarily known for his operas, penned this Boléro as a charming keyboard excursion. It demonstrates his characteristic melodic grace and idiomatic understanding of piano textures.
Project the vocal-style melody clearly over the subtly shifting harmonies in the accompaniment.
Comparable difficulty and character — good candidates for what to learn next.
Boléro 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 Boléro lasts about 4 minutes.
Boléro 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 Butterfly by Aleksandr Ilyinsky, Berceuse Op.57 by Frederic Chopin, Piano Sonata No. 11 in A major by Wolfgang Amadeus Mozart — see the full similar-pieces list on this page.