CSV file with ";" as a separator. First line should be a header, address should be either in "address" or "addr" column, or in the first column. Or you can paste a saved GeoJSON here.
City:
A rectangle that contains all points from the list. Missing addresses would be placed at the south border. After geocoding, double-click on the frame to toggle its editing. Double-clicking a building contour would revert it to a marker.