This is a small apartment with one room and one living room. As described by Andrea, it is confortable for 2 adults and small children but unlike another comment I saw I wouldn't rent it for 3 or 4 adults. Although they are not wide, the bed and the convertible couch are quite comfortable. The bathroom is a big plus: clean, well equipped. Great and central location (5 min walking to the Duomo) explains the price.
PS : There is a great trattoria in the street