Yeah, I’ve been waiting for the day that someone complains about my rollers @ 75 km/h. I’ll be setting up behind my car in the basement car space.
Have you got a photo?
no, he just told me about it
On a tighter budget, where noise is a big concern, I’ll strongly recommend STAC Zero. Right now Clever Training has the variant with built-in power meter (that is, it reports power, but you still adjust effort by changing cadence and gearing) for a good price, and STAC Zero themselves have a crazy good price on the smart version. (They were bought by 4iiii, and they say they’re clearing out stock in preparation to move the company to 4iiii’s HQ.)
It is so astonishingly quiet and right now the pricing is fantastic, especially for a smart trainer.
NYC apartment here (Brooklyn Brownstone built in the 1880s). Two winters of base on trainers and rollers (Feedback Sports Omnium Over-Drive & Tacx Antares rollers).
Positioning is everything. Find the most structurally sound place in the apartment. Idealy where you rear wheel is over a structural bean (under the floor) and point the rear wheel towards a wall or away from the core of a room. Both of these things lessen the noise to downstairs considerably. The worst possible thing you can do is set the trainer up in the middle of a large room away from any structure in the building.
A good vibration dampening mat is key as well. I’ve been using the Tacx training mat (not the foldable one) since last year and it makes a considerable difference from the generic matt I had from Amazon prior.
I wouldn’t feel weird about it from a “what will my neighbors think” standpoint…but how would I watch my Netflix!!! 
Thanks for the info. This is exactly the kind of info I was looking for. Not budget friendly but probably my next step. Maybe it’s just me but my enjoyment of riding the trainer is significantly lower when I feel like I’m inconveniencing a significant amount of the people around me.
I thought about something like this - or a sound dampening box that goes over the rear wheel and trainer. Never put too much thought into it, though.
I think the loudest thing about most trainers is the vibration through the ceiling. That’s why the thick pad makes a difference, but ultimately the smoother the trainer the less vibration all around. Wheel off is the best option, but I’ve doubled up a yoga mat under the trainer and that helps a little bit.
Vibration is a bigger issue than noise, so you have to reduce vibrations (ERG in a low gear to keep flywheel speeds low) and some sort of isolation (thick rubber mats, etc.) to prevent vibrations from being transmitted through the floor, or worse, to keep the building from resonating with the trainer.
I would recommend a silent direct drive smart trainer like the Kickr or Neo.
I haven’t gotten an complaints, but I don’t train after 9 p.m.
First world country with third world housing.
'Straya!
Best option - talk to your neighbours. I live on first floor. First of all - I bought a gym mat. Then I went to my neighbours downstairs, explained what I would like to do, them jumped on a bike and rode it on different intensities for half an hour and then went back for a feedback.
They only could feel vibration especially when I sprinted in a high gear. It was more like washing machine in spinning cycle. So no real issues.
From my own experience - should be no problems with TR in ERG mode. Most of the noise/vibration will be created while sprinting on Zwift.
In worst case scenario - bottle of wine should soften their hearts