I 2nd the comment on the iRig by electriceels. I have the iRig HD, plug it into my iPad (or iPhone) and use Amplitube for the amp models & effects. It sounds good and does not irritate anyone in the house. I can jam along to Spotify or take a Guitar Tricks lesson.
I know it's not an aswer to your acoustic question but it does work well if you have access to an electric guitar. I use a cheapo electric with the iRig (keep them in the family room) and it works great. The good guitar stays in the bedroom with the "time to drive everyone crazy amp".