Ralph Fiennes (Voldemort) was recently interviewed in Paris and was asked what it was like to work with Dan Radcliffe on 'Goblet of Fire'.

He said:

"He's just a charming young man, very helpful. I think it must be very difficult for young actors when they are part of this incredible franchise, and there's such pressure and exposure, and certainly Daniel seems to be keeping it together."

"He's just a very charming person. I'm sure any of you can imagine that a young person can be affected very negatively by that, but he's a very good actor on the set. He does very well in the studio."



Source: DanRadcliffe.com