I'm level 5 more o less and I started with k 32 l 423 not very dificult, and then I learnt k 208 L 238. Beautiful both of them
I did the other way round, K208 was one of my first pieces

Actually I am still working on it occasionally. I was not ready for it the first time, it's not an easy piece although one can learn the notes quite fast. There's so much to work on, balance, dynamics, articulation, phrasing, ornaments, tempo, pedalling...The possibilities are endless.
I love Schiff's recording of the piece, not available on YT unfortunately.
A very different slower version, but lovely also: