Gosh you were lucky, if that mis-spelled email address was valid to another person you 'may' have lost your money !!
Luckily you could cancel, so when you cancel a payment those funds can't do a u-turn > they have to process through to paypal who will as the transaction was cancelled return them to your funding source (if you paid from your bank account or with a card), or credit your paypal balance (if it was funded from that balance), but that takes a few days and sometimes up to a week.
Advice is voluntary. Kudos / Solution appreciated.