I like this abstract friendliness that lots of people talk about. Fair enough to say an open day was friendlier, or a department was friendlier, but it's a bit sweeping to say KCL is friendly and UCL is not. I've found my department to be very friendly indeed, as, incidentally I found the English department at Kings when I went to an open day, but it's a bit of an odd idea to take any large institution and call it friendly. And to make such an illusory claim a basis for choosing a uni seems odd to me, especially given so much of your time at uni is spent living with other students, seperate from the university. But that's just me.