Overall my stay with Sonder was great. I rated them as 3/5 mainly due to the absence of a disclaimer regarding the smell of the apartments. The smell is best described as a jarring musty medley that is "somewhat dirty and more than a little strange". If you are staying for only a couple of nights it is manageable.
I stayed 4 weeks and I had to either wash(x2) or trash anything porous that I brought along for my stay. For example, fresh laundry that was washed the morning of checkout still reeked of Butler Brothers Building when I returned home that night in Atlanta.
Additionally, I had to pack up and move multiple times (2nd-4th-5th floor) due to separate issues which included plumbing and an internet outage during Super Bowl weekend. Sonder was attentive and acted swiftly with the accommodations for my family.