Having found the location before the clue, I realize from your hint you’re location is the experimental house built in an alley way by Jakub Szczesny. Just a coincidence the Warsaw Bridge Memorial is at the bottom of the picture.
Keret House (world’s narrowest house)
74 Żelazna, Warszawa, Polen
52.237703 N, 20.989075 E
Dom Kereta, Warsaw Poland.
https://en.wikipedia.org/wiki/Keret_House
You can’t even see the house in this image!
Having found the location before the clue, I realize from your hint you’re location is the experimental house built in an alley way by Jakub Szczesny. Just a coincidence the Warsaw Bridge Memorial is at the bottom of the picture.
Keret House (world’s narrowest house)
74 Żelazna, Warszawa, Polen
52°14’16.22″N 20°59’21.35″E