I highly recommend Francesco's apartment. It is a large, one bedroom apartment. The bedroom has a balcony that looks onto the street. It's well- located - a 10-15 minute walk to Teatro Massimo in a fun neighborhood. The apartment is well-decorated. Francesco is a delight - very friendly, helpful, and speaks excellent English. I would definitely stay here again.
The only drawback is that the apartment is 3 flights up, so it is not appropriate for the mobility challenged.