Chopin pieces similar in grade level to this waltz?

[larapool]

My professor recommended I learn Chopin's third waltz in A minor.  I'm not exactly sure which one he was referring to but I assumed it was this one, the one published posthumously and is technically undemanding:

It's a beautiful piece and I was surprised at how fast I learned it.  Would there be other waltzes or mazurkas or possibly even nocturnes around this level to check out in the meantime?  The only other piece that I've learned that belongs to those categories is the Op. 9 No. 2 nocturne in E flat.