I actually can't remember if my mum came to visit me at uni, apart from dropping me off in 1st year and coming to my graduation - in saying that, it was 20+ years ago! I'm sure she did. Maybe once or twice in four years, though.
I lived in a flatshare in 2nd year (there was a group of about six of us) and one girl's parents visited every other weekend - it was maddening, because she'd start sniping at us to 'clean the place up, my parents are coming', and ultimately began to feel very intrusive.
We weren't a particularly untidy or dirty bunch (tbh she was the worst of all of us), but it was a typical flat full of young women in their late teens/early 20s, and it got very wearing after a while, considering we all paid the same amount of rent and had clearly missed the vote to appoint her Head of the Housekeeping Police...
So, yeah, parents, if you're going to visit your kids, particularly if they're living in a group house or flatshare - please remember that other people pay money to live there too...