We stayed in Guglielmo's apartment for 5 days and enjoyed it a lot. The location is of course the biggest plus: close to many attractions, we have not use transport in the city at all. The street is a small one with little traffic, many restaurants and supermarket is practically next door. All the windows open into a small yard, and there is some noise from there. We slept with windows closed and air conditioner on. The one in the bedroom is a little weak, so you have to put it on before going to bed.
All in all, it is a very good apartment and we'd definitely stayed there next time.