It was quite comfortable and the professors are lovely and nice. Questions are not so hard, they are usually based on your past experiences and relevant skills to the role.
I applied through college or university. The process took 4 weeks. I interviewed at LSE (London, England) in Nov 2018
Interview
My fellow researchers and I submitted a proposal for an independent project. The process was smooth and fairly easy, although the proposal had to be very detailed. The only think is that it took them quite some time (around 1 month) to come back to us.