What are some good Beethoven's and/or Mozart's piano pieces for beginners?

Moonlight Sonata 1st or second movements. Personally, I prefer the first over the second. If you're a beginner then try the 3rd movement later because its a bit tricky at some parts :P For Mozart, I like the Turkish March. My friend is at around level 4-5 ish and she can play that (just for a comparison).