Well, I own a Pug mix, though I do know a wee bit about Pugs in general.
I hear they do fairly well in apartments... though tend to get jealous if they don't get alot of attention.. They are very "people-oriented" dogs. They thrive on attention and normally want to be with their owners as much as possible.
Do encourage your friend to go to other websites such as HERE or others found through a search engine and learn every last bit she can. You can never be too careful when deciding which breed is right!