First let me say that the cottage was clean, cozy, and well-equipped. But I will not stay here again. My problem was the intermittent loud noise level due to the location of the unit being so close to the train tracks and apparently in the airport flight path.
Caltrain uses the tracks from very early morning to late evening and then the louder freight trains use the tracks.
I am a light sleeper so I chose to sleep in the warm room with the windows open to take in the quiet breeze rather than try to sleep with the noisy wall air conditioner on. Anyone remember the I Love Lucy episode where they kept being awakened suddenly at a motel next to a train track? it was a bad sleep experience for them and I could now relate. I’m guessing that some people can sleep with sudden noise, I can not. Closing the windows helped lessen the noise, but the trains continued to wake me.