We stayed 3 nights in Alberto's flat. What a wonderful experience.
Location: this AirBNB is centrally located. It's a 15 minute walk to the Duomo and a 10 minute walk to some of the best pizza in the world. You must try Da Michele and Pizzeria Trianon da Ciro (they are located on the same block. If you want dinner try Tandem or Tandem Steak which are both close by.
Beds: comfortable bedding with plenty of pillows and blankets
Shower: roomy with great water pressure.
Noise: once night fall hits, the surrounding streets go to sleep.
Bonus: Alberto, the owner is a gentleman with a kind word and a quick response to every need. Make sure you visit his food shop on the first floor for wonderful ready to go food curated from the surrounding area.