We have a dedicated music room. My wife is classical so it has all her strings, piano etc and I am electronic so all my hardware, pute, some guitars etc and even a drum kit. Its pretty cluttered but somehow it works.
in my living room at my parents house (im 13) Someimes its an issue because my $8 headphones are quite leaky and I have to put my keyboard on my lap, and I have the inability to download anything due to using my dads laptop.
B. but i used to have a little setup back at my mom's basement. it sucked because she would complain about the noise. good thing i have my own place now lol