After having initial trouble with the pre-check-in Sonder website and app, we were able to get through. After that our experience, including check-in, was great.
Security let us in no worries when we arrived later in the evening. The unit was spacious and lovely, with a nice view out to the north. The street noise was almost totally muted, with only the occasional emergency vehicle sirens being heard.
We wouldn't hesitate to book a stay here in the future :)