Apartments are managed by property management firms.....of which there are several around.
For the less expensive prices.... I did see 3 2 BR/1BA apartments in a complex (older - but not run down/falling apart) in a good location very close to the 32nd Ave S Hugo's and would be a short drive to most all shopping. Your daughter assuming she has lived here before (or your son in law) probably know the area. I cannot think of the name....just north of Happy Host and right next to Red River valley gymnastics and near where Centre Court fitness used to be (it is now Northern Air Family Fun Center) as the new Choice Fitness and Wellness Center opened up by the park district last year.
Anyway....
Check this link
Elite Property Management, LLC - Properties for Lease in the Grand Forks Community and surrounding areas
The ones are on 17th St S.... I saw two 2BR/1BA 800 sq ft (1 car garage) but coin laundry....for 675.00 and one similar listed for 575 (dont know why lower than the other two for same sq footage).
That is a pretty good deal and for a 2BR is about the lowest you will come across unless you want a much more run down student run area.
Goldmark is another larger company which manages several in town (though their reputation as a company is kind of sour from all the negatives I have heard). But they own a couple newer but several older complexes as well and a wide price range.
here are their listings....
Goldmark Property Management
Oxford, IMM, IRET, Hampton are some other companies, but theirs are usually a bit newer and more expensive. But you can google them and check....
Also Craiglist can be ok....but use carefully and anything without a local ph number or address I would say is likely scam or any price that is just way lower than the rest.