This can be done directly in StreetComplete if you like, using the Address overlay (hamburger menu -> Overlays -> Addresses -> tap on the building whose address you want to change). Address quests are disabled while using it, so if you prefer those most of the time, you can switch back to no (or a different) overlay once you've made those changes.

That said, carefully positioned notes like this also work fine, so if you prefer that and don't mind the delay, carry on. :)