Marco is a very welcoming host! This housing has its ups and downs but overall is a very good option for your visit in Florence. It's extremely easy to get to the center of the city!
Also, there are shops and a lovely pastry shop around. With the help of the kitchen Marco provides you can cook for yourself if you wish to.
I think the noisy/quiet location is a matter of personal taste. We were sometimes disturbed by the street noise but if you're the type that is not easily disturbed you shouldn't have a problem.