I stayed here for a month. The room is tiny but quite nice and has all the essentials you need. It's well stocked and the hosts are responsive and helpful. Although you'll see its age, the place is very clean and is well maintained. The bathroom is comfortable and spotless!
The location is close to Millbrae and BART/Caltrain which is great, but it's on top of a steep hill. When heading back to the place, you'll definitely need a car or an Uber.
The biggest downside of this room is the noise. The insulation isn't great. The room is right next to the main entrance stairs and door which are loud when people enter and exit the building. You can hear the unit above walking around. It's also next to the laundry room which you can definitely hear. Although there are rules about noise and when to use the laundry room, it comes down to the other guests respecting the rules.
I'd recommend it for a short stay.