The bathrooms are like ones you'd have at home, ie shower, toilet, sink all in one room + some extra space, so they can't get in unless you leave the door unlocked
Re-reading what I said about in-flat relationships I perhaps worded it wrong, the point I meant to get across was more that it requires a stronger attraction internally inside the flat for people to have a go at it, because the consequences are (potentially) pretty bad for the rest of the year if it goes wrong. So theres a sort of greater 'attracted' threshold for flat members than there would be for people outside the flat, making it less likely that you'd end up with someone inside the flat.
I understand that a bad experience like that would discourage you from mixed living, but from an objective standpoint I feel like mixed living might help you too - I don't really know the full circumstances, but it seems pretty likely the result of that relationship is still affecting you, so perhaps if you are in that situation yourself you can see it from his point of view, and maybe either (a) realise that his excuse was more valid than you realised or (b) realise that it wasn't and that he wasn't the guy you thought he was. It might help you move on from it (if its still effecting you, this is all very hand-wavy on my part
)
Everyone has a threshold messiness they can put up with, its just down to people to find out what it is, most peoples are reasonable
I'm actually cleaner at uni than I am at home, even though at home my parents do vacuuming/washing for me, so I don't quite understand how that works!