I like things to be as natural as possible, so I like the idea of tickling in a bedroom or living room. For tickling videos, I like bed scenes the best, and that's what I like in real life, too.
If you live with other people, and they're home, I'd say the odds of not being heard are pretty small unless you have an area of the house that is soundproof or if you live in a particularly large house where you and the tickle partner can go off somewhere away from everyone else. I've read on this site about people meeting up for tickling in hotels. I sometimes wonder how they handle the issue of being heard there. If the 'lee tends to laugh, scream, shriek, etc. loudly when tickled, then it seems like some other people in the hotel might hear it and wonder what's going on. You might even get a knock on the door from the management.
This reminds me: Several years ago, I was reading a blog post on a blog that had nothing whatsoever to do with tickling. The blogger brought up the subject of tickling in a post (can't remember exactly how it was presented). One of the commentators on the post said that her husband and daughter liked to pin her down and tickle her because she was extremely ticklish. One day, they did that and got her pretty good, and her reactions to the tickling were pretty loud. Some neighbors heard, and thought something bad was going on. They called the police. So, this family of tickle monsters found some police officers knocking on their door, and they had to explain to them what all the noise was. I imagine that was pretty embarrassing. I hate to say it, but an experience like that might manage to kill my fascination with tickling.