Dario's place was really nice, exactly like I read in comments from other people who were there. It's actually a student flat, so we've shared the rest of the apartment with 3-4 other girls studying at Rome's University. The girls were super nice, friendly and also quiet :) so don't be afraid of student's life & partys :) We had nice, clean and spacious room with private bathroom and giant bath. Although the neighbourhood isn't so clean and quiet (especially in the evening and at night), it's not dangerous at all. You can find a lot of stylish restaurants and bars near the house. Even when the streets are noisy in the evening, the plastic windows reduce the noise perfectly so you can sleep without any problems.
I would definitely recommend choosing Dario's place to stay for your Rome trip :)