She lives above the gallery, so she gets to hear it being played at all hours.
"After midnight you get what I call the plonkers because they plonk away at the piano. I can tell you that Chopsticks is a very popular rendition."
But Ms Star said there are a surprising number of people who "can really play". And she said everybody, young and old, treats the keyboard with respect.
Ms Stead said Mainstreet - the central business district promotions body - had approached her to ask if she would be happy to have the piano outside her shop.
"It's been astonishing to see the number of people who have been playing it - it's a lovely piano, with a beautiful sound."
Ms Stead puts out a stool every morning for people to sit on and play.
Elise Goodge, from Mainstreet, said the piano was gifted from Rotary.
"The idea was to have a community piano. So at first we stored it behind the stage at Majestic Square and it was wheeled out each day.
"But every time it was moved it went out of tune."
So Mainstreet started looking for a more permanent home for the instrument.
"Of all the retailers in the CBD, we knew the people in Guyton St would be the most open to having a piano in the street."
The piano would stay where it was for the foreseeable future.
"It's a bit of a social experiment to see how people treat it."
It's not the first community pianoforte to make its way on to a Wanganui street.
Last year artist and building owner Ross Mitchell-Anyon installed a public piano outside the old Chronicle building in Drews Avenue - though the elements have left it the worse for wear.