Autumnal Interlude is a contemplative short work focusing on harmonic atmosphere. It relies on fluid phrasing and an expressive approach to rubato.
The performer must carefully control the phrasing to avoid a stagnant rhythmic feel.
Comparable difficulty and character — good candidates for what to learn next.
Autumnal Interlude is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 5.
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 Autumnal Interlude lasts about 3 minutes.
Autumnal Interlude 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 Blumenstück Op.19 by Robert Schumann, Am spinett by Christian Sinding, Albumblatt by Johannes Brahms — see the full similar-pieces list on this page.