The apartment is very nice, the location is ok (close to metro and bus, cc 12 min to Duomo, 6 to Centrale), although be prepared that it is a bit noisy and because of the size of the bathroom the guests should be really familiar with each other. ;)
Marinella and her son Marco are great hosts, it is evident that they are experienced (you can find all the maps and newspapers in the apartment) and always available.
There is a very kind service of food and drinks for the arrival (water, juice, cookies and fruits) and you can always use the well-equipped kitchen or pop-into some of the close restaurants.