How do you find cosmia on sift heads

once you've been told by the black fox to go to palemo you will also get another call about where cosima, after that you have to go to an apartment, to get there you first go to the area where thers a sign pointing to the vineyard, the market, and the fish shop, go down the road that points towards the vineyard and then you will see a apartment on the right, go in there and go to the top and go to the room on the right (there will be bad guys in this building) then in the room go to the balcony (using a sniper will make this mission easier) and the mission will start and there will be another apartment, on the top floor at the (I love sex) kill the guy shes f''king and after that there will be a guy walking in the middle windowon then top floor, kill him then kill the guy at the bottom floor window to the far left after that you complete the mission and then get out of the apartment and talk to her and then go to the next mission