Where to begin... we have some thoughts on Palermo, but that is not the purpose if this review... if you are going to Palermo, Angelo's is the place to go. First and foremost he is a wonderful host. Very responsive and has a near encyclopedic knowledge of his city. Restaurants, tourist sites, and everything you want to do while in Palermo, Angelo knows about it and can point you in the right direction.
As far as the place is concerned it is gorgeous inside and out. However do note that it is the nicest looking place on the street. Other building are undergoing renovation, but at this time the pictures on Google maps are accurate, but the street is pretty average for Palermo in that regard. One really cool feature is USB outlets in the bedrooms for charging mobile devices. I am happy when hotels have them but I am really happy when my Airbnb has them! A great touch. Also, Angelo's place has Air Conditioning units throughout the house. A great reprieve from the heat of Sicily.
Other people mentioned the noise... this will be hit or miss, in general the noise is normal for a busy street nearby to bars and a busy square. However, if the crowds are particularly rowdy this noise will be very noticeable. As my wife and I are holiday makers and not prone to late night revelry... we got hit with a rowdy night (Friday, but Thursday wasn't loud at all)... it happens and if you're participating in it, you probably would not have noticed as much. The carrying on in Palermo can go very late though (until the early morning hours).
All in all the place was great, Angelo was fantastic, but Palermo was just not the vacation we were looking for.