I've never found a really satisfactory way to quiet an acoustic guitar. Playing it quietly requires a degree of discipline I just don't have. Stuffing the body with a towel or two ruins the tone, reducing my motivation to play it.

You're left with trying to find times that you can play without bothering your neighbors, finding another place to live (different neighbors), or getting a different guitar.

A hollow-body electric has just enough acoustic properties to let you play it 'unplugged' without bothering anyone (unless your walls are paper thin). But it will sound very different to you when you get to plug into an amp. That means suddenly having to adjust your technique. A solid-body guitar, or a hollow-body guitar with a headphone amp may be a more peaceable solution. Something like a POD will give you a potentially confusing array of effects to experiment with, but you can pretend to play a raging stack, without anyone else hearing a thing.