@Jessica-and-Henry0 @Jann3 the hardest for me was saying goodbye to my long-term guests. One of my first guests here stayed for 3.5 months and then I had another for 4 months. Both became friends. Together, we enjoyed Sunday nights in front of the TV, Christmas dinner, hosting a BBQ, going to the movies, or out for drinks.
Both times when they left it was very sad for me. I had got so used to catching up with them after a day at work and making fun of their cooking! I've kept in touch with both and one has already visited me again.
I would have been happy for either to stay on as a long-term housemate, but alas, their plans didn't include settling down in London.