Your favorite Small Apartment Speakers

Vandy VLR's if you want bookshelves.
Treo's for floorstanders. Though I would put them on an isolating base if living in a multistory apartment.
Bob

@OP,
Yes, I think the Gaia should help with unwanted bass frequencies migrating to other apartments.
FWIW, I hope to be trying some Townshend isolation products with my system. I just need to get some time to play...
And, as an aside,
I live in a single family home about 100 years old. My main system is on the first floor.
If I go to the basement, I hardly hear anything. If I go upstairs, there is also not much I can hear- unless I really crank it up.
Bob