I recently had a two week stay at Kian's place. You can't be any more central if you tried — just 2 mins walk from Farringdon station in a secure flat. Kian was a great host: He was very responsive during the planning stage, and very flexible to my travel. Though we didn't meet a ton in person, he checked in periodically to make sure all was well. I would note that the room is small, but if you're traveling alone, the convenience and kind host can't be beat!