I was in Florence for a two days to attend a conference.
Mauro's house is the typical Florentine apartment and it is definitely big. Very central, it's a few minutes walk from the central station and most of the places that should not be missed in Florence. The room is not very big, but it is fully equipped and perfect for brief stays.
Mauro is a discreet person and he will totally respect your privacy.
Another flatmate lives there, but it didn't happen to meet him because I came back late in the evening and next morning I went out early.