I live in a Victorian era house converted into flats. I never have noise disturbance, except through the door (e.g. someone else slamming the front door). I barely hear music/TV from other flats. Maybe look for a new conversion? There are so many regulations they have to adhere to now for new flats (we have sprinklers...never seen them in a residence before). Although, I think anywhere if you want to set up a music studio there's going to be noise pollution. Studio insulation might do you some good and is fairly effective. 

A new build would be disastrous as they're mostly cheap plasterboard for all they're worth.