I highly recommend staying in Valter's B&B. Valter was quick to reply to my inquiries prior to my arrival and his daughter Chiara was a wonderful host once I arrived. She accommodated my early check-in, gave me a her number if I had and additional questions and arranged a taxi to the airport for me. She even met me the morning I left to make sure the taxi arrived. The room itself was lovely and perfect for my stay. The apartment is literally a 3 minute walk to St. Peter's Square and only a 20 minute walk to other tourist attractions like Campo de Fiori and the Travestere neighborhood. For the nonwalkers the bus that goes into the center of town picks up right in front of the apartment. I thoroughly enjoyed my stay and would stay again!