You should take a look at his Waltzes and Mazurkas. Possible some preludes too. That is basically as easy as chopin gets.
Prelude in c minor and the a minor waltz. That e minor prelude is overplayed but easy...but it's also easily butchered. The man was a teacher and he did write for students.
To be fair, i think the preludes are only worth learning if you intend on playing them as a cycle. To each his own i guess, but yeah I'd go for the mazurkas as well. From my point of view they're his most personal compositions and if you are capable of playing the mazurkas then you're on your way to understanding Chopin in general.They're all top notch but the best are in Op.41 and up. Some are terribly difficult to understand musically (op. 50 no. 3, op. 56) and others are quite straightforward (op. 63 no. 3, op. 41 no. 2, 4, and op. 50 no. 2).