I'll focus on the good first: The actual apartment(s) itself is beautiful. They are spacious, thoughtfully designed, and in a downtown location that is central to everything. The beds are cozy, the furniture/aesthetic is chic, and the kitchen was equipped with everything needed to cook with for a longer stay. The building is secure and if COVID restrictions weren't in place, the amenities would add significant value to your stay.
Now the bad:
I arrived at my apartment at 6 pm. I followed check-in instructions, attempted to access my apartment, only to find that someone was already in it. I had to wait for nearly 3 hours (mainly on hold waiting to speak with an agent), and Sonder informed me they had double booked. Not just that, but they were unable to find an apartment for me for the duration of my stay. Which meant -- I had to move three times. They did make those check-in/check-outs relatively seamless (I didn't have to store luggage, etc) but still -- moving in/out of three apartments was really, really inconvenient.
On cleanliness: My second apartment had fingerprints all over the kitchen and splatters of sticky matter all over the floor. The bedding and bathrooms had hairs. My third apartment was clean upon entry. But one night I unfortunately got really sick, and found myself lying on the bathroom floor. From that viewpoint I saw that a wall panel under the sink was covered in blood splatters. I looked closer at the baseboards to see that they were filthy. All three of my apartment kitchens had food crusted on the flatware and dishes. Not the greatest, and they could/should improve their cleaning standards. Especially with everything going on in the world.
Overall: If check-in would've gone as planned, and my original reservation (one apartment f or 14 nights) would have been honored, it would've been a great stay. It just became so stressful with the multiple moves, and with all the phone calls/logistics/madness to organize those moves. I wasted a lot of time and energy. Sonder did honor my experience, and provided me with a $350 credit back -- which I appreciate immensely. Would I book with them again? Yep, but not through Airbnb. I've booked directly with them in the past and had a flawless experience.