Daughter did a townhouse, and no issues at all in sharing . 4 on a floor sharing 2 bathrooms was fine. plus it prepped her for when she was in a landlord owned accommodation where there was 8 of them sharing 2 bathrooms. She did do an ensuite at Penny street for year 3, and chancellors shared for year 4.
If the accommodation format is the same as when she did it in 2020, then you have to choose one accommodation in one college and one accommodation in another college, so just choose both ensuites in both. Her 3rd year Penny street flat of 12 had two first years, some other years and some phd, so it was mixed. The two first years they were fine, they did have friends round on a saturday evening, but was quite respectful to the others and not being too loud after 11pm.