Stuff to prevent flies getting in the flat??????

...get one of those net hangings...u no like white see-through hangings u c in peoples homes...get them and put it on ur window, place where it opens and all flies cant get in tht way...or use one of those fly killer sprays...I cant think of any other ways...but i live in flat too...and I use the net hangings, the nets are very small so flies cant get through them...or complain to the authorities that the bins should be placed somewhere else because the flies are tresping...Good Luck