Although I still haven't replaced my beloved late cat Molly yet (I need to get a short business trip in mid-July out of the way and then I think I'll adopt), I have frequently visited area shelters' and rescue leage's web site lists of both cats and dogs.
I've seen some very cute pugs listed. What the sites tend to warn is:
-You have to clean those wrinkles on their faces daily, or else they get dirty and nasty quickly. Pugs have no way to do that themselves.
-They tend to make snorting, sniffling sounds in the course of simply breathing, much less barking. If you don't like that kind of sound on a regular basis (it might be a bit much to deal with in a small apartment), consider another dog.
I don't recall reading if they were apartment-friendly. For the most part, shelters here tend to prefer their dogs be adopted by townhouse or single-family home tenants.
I live in a condo building with thin, not-soundproof walls and I have to say just about every dog in my building is "not an apartment dog." They bark all day, they bark when anyone makes 2 steps in our main hallway here, they bark at everyone they see when out for a walk.
And I love dogs, despite never having owned one. It just seems like every dog in my neighborhood is unfriendly, doesn't like condo living, and probably would be happier in a townhouse.