Positives: the apartment size is decent and the location is convenient to a lot of places. The area overall seems quiet and safe, though at night you can hear voices from adjacent flats. The beds are large and quite comfortable. Additional towels and sheets were provided when asked for. The flooring is generally in good shape and is easy to keep clean. This was the most economical option we found in the Mountain View area for our dates.
Negatives: It is an older ground floor unit without much privacy (patio door and kitchen window face a shared walkway). Many of the blinds are missing slats. Bathroom lacks a fan, and water pressure in the shower is poor. No air conditioning and only one ceiling fan on premises. Beds are comfortable but most other furniture (coffee table, bedside tables, chairs) is very basic. Curtains and rugs also feel cheap. Shelves in the kitchen are a bit gross (no shelf liner, just paint). For long stays especially, note there is only shared coin laundry and there is no dresser to put away your clothes. The power outlets are ungrounded and there are not many (and not located near the desks).
Particular issues we had: We realized on the first morning that the fridge was not working and this was a source of stress (why else does one book an Airbnb?). The following day another (used) fridge was swapped in, which worked fine for the remainder of the stay. While the response time is quoted as 1 hour, 12-24 hours is more typical.