I am replying as a current King's Computer Science Student, who just finished 3rd year. Most of the moduoes in the AI MSc are offered in 3rd year as well.
I wouldn't worry too much about the reputation of King's, while it's on the decline a little, it didn't stop me getting a really good job offer. That depends more on you as a person than your Uni, as long as the Uni isn't terrible.
Unfortunately I can't help with accommodation as I'm living at home.
I think one of the professors frequents this forum and may be able to provide more info.