Ds is home in a couple of weeks for my brother's wedding. It's on a Friday and he has labs first thing so he won't actually make it there for the ceremony, but will arrive just in time for the wedding breakfast 
He's one who's taking a long time to feel at home, but he's been out today at a non-uni gaming event and had a good time, so that's been nice to hear.
AveQ - She hasn't really clicked with her flatmates. Is that unusual or do most make their best friends there? Where else do people find friends?
After a day or so I don't suppose anyone's really felt much of a click yet, so I wouldn't worry about that tbh.
Some flatmates really bond (my dd2 was very lucky in that respect), but you only need them to be straightforward to live with really.
Otherwise it's people on your course, people from other activities, and random connections. (One of my best friends at and after uni was the girlfriend of someone my boyfriend met playing rugby.)