It was a really enjoyable stay at Daniela&Paolo's. The room is spacious and is like on the pictures. The flat is really clean, the bathrooms and kitchen are cleaned everyday and the breakfast is refilled everyday too. There are five guest rooms but since there are 2 bathrooms we never get any problems of waiting.
The location is great, there are two underground stations near to the flat but you can go to all the touristic spots by walking (except the Vatican).
I will recommend it !