I find it hard to believe that there's nowhere close I can go to buy some screws - in my home country Belgium there's several hardware stores within 10 min biking. Is this a cultural thing? :)
Now I know that my destination is Belgium ;)
In return we have a lot of boutiques, pharmacies and perfume shops with preservatives for women. If parachute from a plane in a pitch black night and after landing you can see at least three pharmacies, you are in Poland.
Uncle Google says there are hardware stores in the Mokotów area: 1) ul. Modzelewskiego 58a 2) Bartycka 24/26 and 3) Puławska 74 / 10