Caleb and his wife are very kind and helpful, always ready to chat if you want to.
The room itself was tidy and clean and therefore absolutely fine, I have nothing to complain about. The flat is on the 9th floor, but there's a lift, so don't worry about that.
The next underground station is a bit far, but since there are several bus stations close to the apartment, that didn't bother me at all. :)
All in all, I had a great time in London and felt totally comfortable with Caleb, his wife and my room in their flat. Thanks for having me!