Yeats does not tell us specifically where he is standing at that moment. Our only clue comes in the second to last line of the poem, which reads "While I stand on the roadway, or on the pavements grey". This implies that he is in an urban area, perhaps a city filled with smog, the hustle and bustle of commuters and endless city noise.
This environment is vastly different to The Lake Isle of Innisfree, which is described as a serene, peaceful place, where the poet will live a simple life tending his bean rows and beehives. Yeats makes reference to sounds he will hear on the Lake Isle, such as crickets' song and the lapping of lake water.
The Lake Isle would therefore appear to be vastly different to the city environment in which he currently seems to be situated.