Noel's flat is so charming. I loved coming back to it for the five nights I stayed there. Everywhere there were thoughtful touches for guests (I am sorry---I had a very early flight, and I forgot to return the Sube card, but there was even that).
The location was perfect if you are looking to stay in Palermo. Everything was very walkable, and it's close to public transit. Also, it's a quick walk to a street with lots of taxis.
Her sister was at the flat to greet me, and she was very responsive the one time I needed to contact her. She's also super nice.
The one thing I would say for the allergic is that on the first level, it is a bit damp. It did not bother me at all, but as an allergy sufferer, I thought it pertinent to mention.
Again, this place is so charming. Hghly recommended.