First, we would recommend Casa Didi to anyone- wonderful location, ample space and modern design, and very responsive hosts.
We had a wonderful stay here, and have suggested a few things to Didi and Masemo. The parking situation is street parking- I booked it thinking "Free parking on premises" meant there was a reserved space, but this was not the case. In the end however, I found a parking space nearby in which I left my car for three days straight without any problem. Didi and Masemo were incredibly helpful in arranging a high chair and crib, and provided food and water for snacking on arrival. We traveled in the end of summer and found the rooms to be quite warm despite the air conditioning, but the fans were really helpful and we were comfortable nonetheless. The check-in and check-out process was very easy, and they were wonderful about sharing their tips about where to go in Roma.
Thank you for your generous hospitality, Didi and Masemo! Highly recommend this place to anyone.