Roberta is a very diligent host - extremely prompt and helpful in responses while we were planning; made us feel very welcome on the first day with a set of yummy pastries and advice on places to see and eat.
The apartment is compact and very comfortable for four or five, as long as you can manage with a single bathroom. The location is very convenient with Roma Termini a short walk away and the metro station even closer. The apartment is on the sixth floor, so while the small lift does its job, make sure you are able to climb up or down six floors if a sudden need arises.
Overall our memories of Roberta's apartment are wonderful - our holiday was memorable and the apartment an integral part of it.