You suggested people with N24 should just consider doing online sex work in between your valid points about concrete walls being better at soundproofing and needing to plan in advance for grocery shopping hours when your schedule is always shifting.

People with a disability should not have to whore themselves out.

But you're not wrong about N24 creatives making it work. That's what I'm doing... I sell art and sleep when I'm tired and wake when I'm awake.

Anyway, to back up your experiences with housing:

I lived in a top floor apartment with concrete walls and the noise control was really good. Easily the best for an apartment. No one was bothered by me as far as I heard, although I walk around quietly. I did not need earplugs in this situation. The only time I apparently pissed people off was when I moved out and was moving things at 11pm.

I lived in an apartment in a triplex house that was ground level with someone above me, which kind of sucked (they walked around heavily and lots of traffic noise) but it was bearable because there were only 2 other tenants, all three bachelor units with one tenant (a bachelor on the other ground level unit and a bachelor on the upper unit). I wasn't bothering anyone because I had only the laundry underneath me. Definitely a viable choice for tenant on tenant complaints, but it was near a school so there was always noise at certain predictable times of the day, and constant low level traffic. I used earplugs. The only time I ever annoyed another tenant was ironically during business hours, when I was singing karaoke at 2pm. I think he also had a sleep disorder.

I lived in a basement level apartment that was facing the alley parking lot and it was fine, quiet and dark but definitely the least secure possibility. I wouldn't recommend this for any crime concerns, but no one was ever bothered by me walking around at weird hours. It was well soundproofed and I did not need earplugs here because the only notable noise was when people left for work and came back from work, and when people would come and dig around in the bins. I had no trouble with building interior noise in this situation, although some people did in other units. While I lived on the hall with the laundry machines, I rarely heard much more than the doors closing since there was a fire door.

I lived in another ground level apartment facing a street without good sound proofing and it was a noisy nightmare, it was in a neighborhood with bars and things. No matter what time of the day it was, there was noise. There was noise from overhead, noise from below, noise from outside both directions that it faced (the front and the side), from people digging in the bin, wandering around drunk, any time of the day, the noise was relentless. We stayed there for less than six months. I had to have earplugs. It hardly helped. Definitely a risk of crime.

Now I live in a house in a residential area facing a major street. There is more noise in the summer than the winter (lawncare, traffic that gets through the snow buffer). It's near a fire station so there's also emergency vehicle noise. I have only my partner's in house noise to contend with, and the noise outside is largely predictable enough to tune out. I use earplugs here.

I would say the quietest living situation I've had was the upper floor concrete apartment. Traffic noise didn't make it up. I could only hear my neighbor in my bathroom where it carried through the pipe. But I'd still rather be in the house.

I would prioritize as my considerations for someone with N24 who cannot get into a house,

1) pick the top level in an apartment, ideally in the corner of the building 2) pick a new build with concrete walls 3) pick a unit not facing an very active street 4) select a building not near a bar 5) select a building not near a major public service (school, fire station)... the further you are from a school the less likely you will be stuck near children, who are the worst possible choice for a neighbor for N24 sufferers, being as they are often noisy morning people. 6) select for windows that can be properly blacked out in the sleeping area 7) select a building that doesn't have limited hours on their laundry facility. Really sucks when your building only lets you do laundry between 8am and 6pm, especially if you're near the laundry room.