I stayed with Jason, who is one of the nicest people I have ever met in my life. So very gracious, considerate, positive and cheerful - so much so that we went out to dinner together and have become friends and stay in touch. I came to town for an event at the Olympia and Jason's apartment is literally across the street to Olympia London (exhibition hall) and right next door to Kensington Olympia train station. The guest mattress is like a Japanese futon mattress, not an issue for me because I sleep on something similar, but wanted to make fellow travelers aware. Shared my feedback with Jason and he will upgrade the mattress to a more modern western mattress. Had a great time learning about Jason over Korean coffee and dinner, fascinatingly interesting and talented person, really fun to talk to. Amazing experience. If you are coming for an event/exhibition/fair at the Olympia London and Jason and Stephanie's place is available you'd be a fool not to grab it as soon as you can!