The ear plugs were the first sign. Usually it's a mint on the pillow. However if you are happy with a bit of noise, then this apartment is a good choice. Central, not too expensive and the communication is excellent. David sorted out a minor issue very quickly and with good humour.
From other reviews and the location I had expected street noise. What wasn't clear through the listing, feedback or street view was that a late music bar has opened on the ground floor of the building. While the ear plugs took out the vocals, I could feel the music vibrating through the bed. It closed at 2am on a week night.