Hello @Calvin173 ,
Even though I love the idea, I think it will catch the eye of every guest, as it's not very usual to have such object in your Airbnb, I personally would not recommend.
I used to have very old, not expensive acoustic guitar as a decoration in my Airbnb. It didn't even have all the strings, and I know for a fact that many of my guests have touched it, tried to play, even with no musical knowledge or background. It became more of a toy than an instrument.
I also had a guest who played couple of songs and posted it on his social media, which was fun 🙂 however, I found guitar a bit damaged, with scratches.
Hope this helps!
Best,
Sanja