I'm a co-founder of the NYC real estate brokerage, Yoreevo, and I'm sitting in a WeWork as I write this.
Before signing up for a communal workspace, I wish I had known how loud it could be. That's especially the case if you're planning on working in an open area like WeWork's Hot Desks. There are phone booths, but not enough of them and not enough people choose to use them.
We have an office, but even that can be loud. We're right next to two doors, which are very loud every time they're opened. It's not a deal-breaker, the space still works for us, but depending on how you like to work and what kind of industry you're in, the noise can be a deal-breaker.