This is a variation set based on a popular light theme, typical of the guitar-virtuoso-turned-composer school. It features rapid scale passages and arpeggiated figurations that test the performer's facility.
Maintain a light, detached articulation during the rapid variation sections.
Comparable difficulty and character — good candidates for what to learn next.
'Tra La La', Air Varié (Op. 15) 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 'Tra La La', Air Varié (Op. 15) lasts about 4 minutes.
'Tra La La', Air Varié (Op. 15) 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 'Le songe de J.J. Rousseau', air varié by Matteo Carcassi, Alexander's Ragtime Band by Irving Berlin, Rondo capriccioso in E major by Felix Mendelssohn — see the full similar-pieces list on this page.