The inhabitants of that street impressed me peculiarly. At first I thought it was because they were all silent and reticent; but later decided it was because they were all very old. I do not know how I came to live on such a street, but I was not myself when I moved there. I had been living in many poor places, always evicted for want of money; until at last I came upon that tottering house in Baker Street, kept by the paralytic Mrs Hudson. 221B was the third house from the top of the street, and by far the tallest of them all

From The Casebook of Erich Zann, Consulting Detective.

...The absence of Conan Doyle / H. P. Lovecraft cross-overs is not satisfactory.

Leaning back in his armchair of an evening, he would close his eyes and scrape carelessly at the fiddle which was thrown across his knee. Sometimes the chords were sonorous and melancholy. Occasionally they were fantastic and cheerful. Clearly they reflected the thoughts which possessed him, but whether the music aided those thoughts, or whether the playing was simply the result of a whim or fancy, was more than I could determine. I often heard sounds which filled me with an indefinable dread—the dread of vague wonder and brooding mystery. It was not that the sounds were hideous, for they were not; but that they held vibrations suggesting nothing on this globe of earth, and that at certain intervals they assumed a symphonic quality which I could hardly conceive as produced by one player.