Hm. Alright, the core idea here is interesting, but I feel there's a lot of issues, both in grammar and execution.
About the execution, the piece begins slow and repetitive. You start with 'I don't know how he found my address' and then tackle this same problem a few paragraphs later; it even answers it, making that first line feel both unnecessary and outright conflictive to the rest of the article. We keep going and the rest of the article feels rather rushed, especially from the point the two enter Mrs. Elizabeth til Wolff leaves after London and the cat. Also, the explanation that the cat and London gave felt very info-dumpy; not natural at all. They just happened. To finish this, I think the interview should be in a division of some kind, to separate it from the narration part of the journal (But that's more of a 'I'd prefer it that way' rather than an actual issue so it's fine as is XD)
About grammar, my first problem is that dialogue isn't ended with periods, instead leaving them open and adding a comma after. I think you need to add punctuation inside the dialogue. (There are more grammar mistakes but I don't have time rn. If you ever see this message, please PM me here on wikidot and I'll send you a list of grammar stuff to fix.)
Overall, I wil downvote this, because there's a lot of faults, but I think the main idea here is solid, and it's interesting to see Mr. London's past, since he is a rather mysterious fellow. I would recommend rewriting this piece after the contest~
