Concentrate on playing a short staccato note followed by a longer legato note in order to master this piece. Lift your fretting hand off the note to shorten it, and touch the string with your plucking hand to shorten your notes as well. These are percussive devices.
There are a few different arpeggios in this piece, the A minor and the E7. Practice the A Harmonic minor scale using various fingerings. Play along with me slowly and then play along at the original tempo.