If he's going to some of those places, it's probably better to include a multi-tool instead of a knife. (makes more sence and raises less eyebrows in a urban enviroment)

In some parts of The Netherlands (if he's going there) like some places in Amsterdam, you can't carry knifes or multi-tools at all.

My advice: ask what his exact travelling-route is, try to find as much info as you can and pack accordingly. But you probably figured that out yourself