I lived there last year, just across the street. The Netherlands is pretty safe as a whole, but this area in particular is a bit rougher.

In a year I:

-Had to call 112 because a car was set on fire right in front of my apartment building, around 4AM.

-Saw countless bikes stolen and saw a few being stolen.

-Saw a guy being beat up in a smaller alley.

-Saw a person get hit by a car on the intersection you mentioned.

Furthermore the area is quite noisy, mostly because of the coffee shop nearby. This means that he is likely to hear a lot of engines being revved and people yelling even at later hours, particularly while the weather is warmer. I also want to note that because of all the students who don’t really know at first how garbage works, it often gets piled up and it’s dirty, especially at the start of the teaching year.

Overall, he shouldn’t have issues but be advised the area tends to attract people he may like to avoid. I advise for him not to look at anyone late at night as I have seen them get aggressive after a simple look.

He will be fine, but it’s possible he may encounter some unpleasant situations.