Hi! I actually live in an off-campus apartment, so I don’t think pictures would help you out too much, but if you go to Northeastern’s housing website you’ll find a lot more information about freshmen residence halls!
Each residence hall is different, so it depends on where you end up, but all of them are definitely clean and kept up nicely. The common areas, hallways, and communal bathrooms are cleaned every day, and then it’s up to you how often your clean your own individual room!
As far as loudness, it will probably never be silent like it would be in the suburbs, but I never found loudness to be a problem. I lived on Hemenway Street and Columbus Ave, two of the busier roads around campus, and never had a problem. By October, you probably won’t even notice the sound of cars - it just becomes background noise.
Let me know if there’s anything else I can help you with!