Dida's house is a wonderful place to stay. The apartment is fully equipped and very clean. It's in an excellent location, just a few steps from the metro and bus station. It only takes you at most 20 minutes to get to any major sights in Rome. Its proximity to Vatican is very useful if you want to visit St Peters Basilica or Vatican Museum in the early morning (without the crowd). The neighborhood is very secure and have plenty of good restaurants!
Valentina is an excellent host! She waited for me outside the apartment on the day of arrival. Also, she provided me with a power plug converter after I asked her about where can I purchase one in Rome. She even has a booklet of restaurants, bars, and cafeteria that she recommend. I tried several restaurants she recommends and found her recommendation more accurate than tripadvisor or lonely planet.
I would definitely stay here again when I come back to Rome! I recommend this place to anyone who's traveling to Rome!