It's not just about noise. What happens when bub is crawling around at 6 months and your house mates have left stuff on the floor in common ground, or the bathtub is always left dirty, or glasses are left on coffee tables from the night before and bubs pulls it down, or knives are dropped on the floor and left.
When you have your baby, you will be hyper vigilant making sure everything is safe- and other are not that careful. Ever. Even when they say they will be. Seriously, most Dads are not as vigilant as Mums. People can say they will be careful- but things can be so easily overlooked.
As for the uni load- I honestly think you're being naive about life with a newborn. So many women struggle with basic things like finding time to shower and clean the house, let alone study. A 6 month break to look after you baby is not going to be that big of deal in the grand scheme of things. You may also regret not taking time off to be with baby later on...