I think xeorex means to get acoustic sound from an electric? When apartment dwelling, I know even playing acoustic could be problematic. If your neighbours are further away than the other side of the wall, screw em! ;)

You can get some clean sound just by using your stereo and headphones if you do not have an amp. If you do have an amp, you probably have a clean setting. If you want to further emulate acoustic sound, you can get pedals that will do that. At the least, with amp settings and a bit of reverb, you can do pretty good.

'Course, nothing sounds like an acoustic besides an acoustic. :)

[Edit] Since you apparently have a computer, you can probably use the Line In on your sound card. I have never tried that, so can't give any advice; my pedal has a midi connection.