I play in my bathroom in front of the mirror, no not so I can look at myself (I'm not that vain) but because acoustics (guitars) sound really really good in front of the hard surface of the mirror in the small reverb chamber of the bathroom.
I *wish* I had an acoustically perfect room in my house to play in, I've played in some nice studios and the difference is night and day. I would play my electric in the bathroom as well, but I'm not lugging all that equipment in there. But the acoustics of the room definitely make a difference in electrics as well, just ask any recording engineer why they record the amps in acoustically perfect studios.