I have a Roadster Combo in my thin-walled apartment. A little knowing your neighbors can go a long way. After a month or so of having it, I've asked my neighbors if they could hear me play and all of them said no, much to my surprise. The trombone player that used to live above me, on the other hand, resonated everywhere. Play during daylight hours, not during prime time television and I doubt you'll get much flak. After dark, I play into a direct box through my cpu, using headphones.
I do keep it very low, but it sounds good, of course not as good as at break-up. Lugging it up to the 2nd floor solo sucks, and sometimes I'll leave the combo in my trunk if it's only 2 or 3 days between practices. I'd guess the clean mode is the one which is easily heard through walls, it just sounds much deeper and richer. Then again, most of my neighbors have horrible taste in music, and I have no problem culturing them to death metal. If you have neighbors who would rather read a book on a Sunday afternoon, that might be a different situation. Know your enem.. err, neighbor! You will not appreciate the amp fully, however, unless you have opportunities to open it up.