A late-Romantic parlor piece intended for amateur enjoyment. Its defining quality is its atmospheric, hymn-like quality that relies on sustained, lush harmonic textures.
Mastering the control of the damper pedal to create a rich, sustained sound without blurring the harmonies is the key task.
Comparable difficulty and character — good candidates for what to learn next.
Beside Still Waters 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 Beside Still Waters lasts about 3 minutes.
Beside Still Waters 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 Berceuse by Johan Peter Emilius Hartmann, Brise du soir by Eugène Nollet, Albumleaf No.11: Nocturnette by Shuwen Zhang — see the full similar-pieces list on this page.