I left a note at 4:00AM to express my experience because I couldn't get any sleep.
1)	Furnace: Non-stop running thru-out the night. Worst was on Fri night/Sat morning. Sounded like a non-stop train with intermittent rattling noise. I asked the tenant whether he knew how to turn down the fan at 2:30am when he was in the kitchen preparing food. And no, the tenant had no idea how to deal with the noise. Eventually, the sound stopped at around 5AM. And no, it was not because “I was more sensitive to sound”.
2)	Loose door-knob: I almost couldn’t get back into the room after closing the door because the door-knob was so loose.
3)	Mattress & pillows: I needed to go to a yoga class to realign my back, and to get rid of the neck and head aches.
Summary: I only needed a quiet, clean room since I was out most of the time during the day. I ended up paying for a room that I couldn't sleep in. Guest beware: Other than having the noisy furnace located right below the room, it's also right next to the kitchen and long-term tenant/other guests would cook/clean up at wee hours.