Francesco is a very welcoming host and it's true that it's hard to find a place like this in the historical center! He has accepted our late check-in, that was very important, because we arrived late in the evening.
Francesco has also given me some tips concerning Naples, that was really nice!
A note for future guests: in our room we had a very hard mattress and some problems with the isolation so if you're sensitive to noises, it might be pretty difficult to sleep.