If you want a good easy song thats quite slow and easy on the ears "bright eyes" is nice and really easy.
Also Pretty Woman is a good one its on this site and only has two chords it was one of the first I learnt and its good to get your fingers streching if you use one finger per fret rule.
oh and smells like teen spirt is good and easy but sounds better with distortion....

Hope ive helpd ya