I called the cops on a neighbor and they came back and told me the guy worked as a ramp agent at the airport and had significant hearing loss, so they told him to get a set of headphones for the TV. After their report back to me, I had a little more compassion for the neighbor. I'm guessing 90% of the time you won't get cops who do their jobs as well as these guys did.
For the roommate situation, get in a position to make enough money that you don't need a roommate. Then if you want, you can get an Indian programmer visiting on an H1 visa to share your flat, on condition that they leave no deposit and sign no lease. Then you can kick them out whenever you want. But it turns out they make great roommates. I've had three. They all left suddenly for jobs in other states, but I didn't need their money to pay the rent, the extra cash was just a bonus.
For the roommate situation, get in a position to make enough money that you don't need a roommate. Then if you want, you can get an Indian programmer visiting on an H1 visa to share your flat, on condition that they leave no deposit and sign no lease. Then you can kick them out whenever you want. But it turns out they make great roommates. I've had three. They all left suddenly for jobs in other states, but I didn't need their money to pay the rent, the extra cash was just a bonus.