I'm in two minds about this really.
I don't think he's been one of the best performers this season. Indeed, I said towards the end of the group stage that I didn't think he deserved a single knockout stage appointment (a performance in a Man City game was especially dreadful) so I can't really support this appointment.
On the other hand, he has been a safe pair of hands for many eyars and a referee that I have generally liked. I think his style should suit an all-English final quite well.