Our stay at Catia's place was ok. It was a good value for the money we paid, considering that we were 13 people. The location is good if people can walk, otherwise Rome is only accessible by taxi (don't bother taking buses, they are overcrowded and the traffic in the morning is awful). The place is clean and fits 13 people very well.
Two main issues with our stay: communication and disposable items. Regarding communication: it is frequently difficult to understand what Catia means, especially in writing. In the end, I simply said that we would figure it out at the check-in, and not waste more time with airbnb messages. As for the disposable items, I refer to toilet paper (and in some way to towels). Sorry to tell the truth, but I have never seen such a greedy host. She wanted to charge us for additional towels (only one per person for a 5-nights stay), and every toilet was provided with 2 rolls of toilet paper. We finished buying our own toilet paper and towels, because this is simply ridiculous.
Overall, the place is ok. I would not stay here again, but it might be a good economic solution for large groups.