And air 'freshener' is the biggest bogus piece of **** ever, it doesn't clean any accomodation it just masks it with chemicals. Also I've noticed that druggies use incense to mask the smell of their drugs so they don't get caught so quickly (if the police can even be arsed). And did you know that perfume actually reduces men's testosterone? It's not about noses, that's bullshit, it's about other people's health concerns such as lungs, getting sleep, living in clean accomodation.
I know and I don't use it. It may be the oldest underground system in the world but it's pretty disgusting as well as being among the most expensive to use. Newer ones in the far east sound way superior in every way. Of course comparing that to living accomodation isn't really so relevant. You don't control who moves into rented places, you do control whether you use the underground or not.
The Hong King MTR is immaculately clean and reliable, it's nothing like ours, though obviously it's relatively new. Ironically, it was designed in Britain and we built all the trains. The Japanese underground is also spotless and reliable, but ridiculously, all the tube lines are run separately and none of them actually meet up with each other. If you need to switch lines, you need to go up to street level, find another station and go back down again.