How do I visit the Apartment on the citadel? and where is that mission
"Priority: The Citadel II"? and where is the "Silversun Strip"?

@9300934542

You will reach the mission if you follow the main game path.

Then you will get the massage I refereed to in my previous post on your Shepard's personal terminal, after that you will have an option to go to the Appartment and the Silversun Strip after you dock at the Citadel or at the fast travel terminals inside the Citadel.

What do you mean when you say the main game path? You mean some of the main missions?

And what did you mean when you said kasumi must be unlocked?

I am sorry If I can't understand easily.

@9300934542

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9300934542 wrote:

What do you mean when you say the main game path? You mean some of the main missions?

And what did you mean when you said kasumi must be unlocked?

I am sorry If I can't understand easily.

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Yes, it is a main mission.

I posted two links above, about everything you need to now about this can be found there.

And again, it is as @Fred_vdp said, you can't make Kasumi a permanent squadmate, she only can accompany you in the Arena fight simulations.  

ok I will check the two links again and see what I can do. I will receive admiral hackett's message when I do the Priority: The Citadel II? 

But I can't find it at all! 

I did some main missions like Cerbures lab and curing genophage and investigating missing scouts and I still can't find that citadel mission!

I got admiral Hackett message!!!!!!!!!!!! All what I had to do is just finishing some main missions then I got the message!

Thank you for all your answers.

You were completely right! 

Thank you again!