I stayed at Sonder for a month between leases.
Pros: LIC is great and super convenient to get to anywhere in Manhattan (if you’re visiting, visit the waterfront gantry park!). The place is clean and exactly as pictured. The staff are super responsive. There is a doorman and they accept packages. I stayed when the place just opened so everything was new.
Cons: Check in was a bit annoying - if you’re going to take advantage of Airbnb’s platform I don’t think you should then make others download your platform. But once I got the code it was fine. As stated there is no laundry in building but there is a laundromat across the street. For my unit, the water pressure was great for the first few weeks but suddenly dropped, not sure why. Also the bathroom sink would run rusty water for the first few seconds.
Overall, I would stay again. I understand prices fluctuate depending on demand so it might be worth checking to see if prices switch.