Excellent getaway! I went here recently on a bit of a staycation since it's only an hour and half away from CdA / Spokane. I wasn't completely sure what to expect as I hadn't been here in a few years and even then we didn't stay.
This time we stayed and found a clean room with calm quiet view of the river and surrounding mountains. Didn't hear other guests and the room was pretty good sized.
We got room service delivered, which was delicious and came in probably only like half an hour. Also, played in the Casino, lost it all of course but I expected too and it made for a fun time after dinner.
This place is super relaxing, convenient walkway under the highway next to lobby area takes you to Downtown Bonners Ferry. It's not huge but there is a visitors center and actually a few cool shops and restaurants that are worth a look.
All in all I highly recommend stopping off at the Kootenai River Inn. The casino is small but as a whole it's fun hidden gem in North Idaho.