We had an excellent visit at Francesco's place. It is well-located, and has all the amenities we needed. It was walking distance to the Duomo and to most of the major sites. It was cozy, but plenty of space for two people.
Francesco was a charming host and met us at the apartment. He gave good advice and made sure that we knew how to use everything in the apartment before he left.
The only downside was that the foldout couch was not very comfortable, but then again not many fold out couches are good for sleeping.