Marzio is a very nice host. He has many apartments in the city, so he will be able to accommodate most your requests.
We are a family of 4 and we stayed in the large apartment "I due soli". The apartment is wonderful, clean, new and with two bathrooms. The elevator is in the building although the apartment is at seconf floor. It's close to downtown and free parking is available on the street.
Our total stay was 8 days, but because of Marzio's booking mistake we were booked only for 6 and the last two days of our vacation we had to move to another of his apartments. He let us know just few days before, but he offered himself to take care of everything. Unfortunately the other apartment was much smaller, with one room for all of us, in a noisy building and no elevator. Marzio was very kind at the beginning of our stay and he didn't charge anything for the other two days in the first place. But to my deepest disappointment, after we moved he charged us €50/ night, which is just a little less of what he usually asks for that apartment.
Moreover, I booked "I due soli" for 4 people, but actually one of us joined me only on Friday, so the entire stay at that apartment we were only three people. I didn't mind pay for four people for the whole stay because it was fair. I also didn't mind moving to another apartment. But considering the trouble of moving into a smaller apartment and that I paid for one more person which didn't use the first apartment, I didn't expect to pay for those extra two days.