Johan23
I fly the 737, but I've got friends that fly the A320 and told me very good things about it and use it to prepare. It's a study level addon, just like PMDG is for me.
But I think you will need at least a joystick. You can get one for 30 euro.
Read ECAM (ipadecam.co.uk)
Or you can just use this if it's acceptable for you.