If it bothers you when you're looking, it will could be a problem with you living there. Many of my clients don't see and hear things like that when they're looking and it becomes a real issue once they're living there and hearing it constantly. On the other hand I used to live right under a runway. For the first two weeks I didn't sleep a wink, then I got used to it. Then on 9/11 when the planes quit flying it was almost too quiet not to hear them. Very spooky in fact. The other thing to think about is you can't really control the neighbors. You may move into a quiet unit today and get loud neighbors next month. If you really like the unit, you might get the current owner to be the bad guy and complain to neighbor or management. It would probably be easier to get them to do it than for you to do it. They've got the most motivation to make it happen.