Space was beautiful! Cleaning was mostly hotel-level spick and span, with the exception of the fridge, which was full of food from past guests. The neighborhood was mostly other corporate and upscale apartments, and the space was just as described. The "locked luggage storage" was actually just a supply closet, so don't leave valuables around.
You will be asked to fill out an extensive questionnaire on the Sonder website, off-Airbnb, including an upload of your ID and contact info. This is nonnegotiable, and they are unable to issue the automated access codes unless you do so. Sonder will contact you regularly off-airbnb as well, including to ask for reviews at the end.
If you'll need customer service, unfortunately this is not a great company to go with. Each message on airbnb directs you to a new service representative, with mostly automated replies that are very long and unhelpful.