see Poland Street 1 to 9 & 49 to 62 in London Addresses dataset
Vincenzo Lunardi DNB 1759-1806 the first balloonist in England gave his address in September 1784, shortly after his first ascent, in a newspaper advert as 6 Poland St. This may have been convenient for the Pantheon where he displayed his balloon. His landlady would have presumably been Mrs Wright (qv)