We had a very nice stay at the very spacious Baullari II over the New Year holiday. The flat is wonderfully located a block away from Campo di Fiori, and only a few blocks from Plaza Navona, and an easy and pleasant walk to many other sites such as the Pantheon, the Spanish Steps, Tivoli Fountain, the Jewish Quarter, etc.
The beds were quite comfortable and the flat stayed very quiet inside, despite bustling activity in the areas below. The kitchen had everything we needed to have breakfast and other meals in, but with the amount of bakeries and spectacular restaurants within a 1 minute walk, you won't use it for much.
Great stay!