I did my masters at the Courtauld and dealt with some of the issues you mentioned. It was definitely isolating, although COVID hitting mid-year certainly didn't help, and very difficult to find work on an UK tier 2 visa. In terms of the workload, I actually found it quite underwhelming. It's pretty much 1 class with two 2-hour lectures per week and minimal reading. My advisor was wonderful and very open to chatting about whatever. The prestige has certainly helped me out immensely with post-grad opportunities, but the cost (while much lower than most 2-year programs) is still considerable.