hey bella0123,
the rooms are very clean to start with but it is up to you after that to look after them.
in terms of bathrooms, it depends which building your room is in but usually no more then 5 and you can use any bathroom in the whole of the hall so everyone usually finds a fav one that they use.
WeiChin, i will try and get pics of sing and twin rooms, i am not currently at the halls because its the holidays but i can see what i can do.