When staying with Roberto, I received a hands-on host who was very easy to contact and provided many fantastic recommendations during my stay, especially food. The flat is located in an tourist-free area within walking distance of the train station, several metro stops and many historical sights.
The flat heating worked great, Internet was fast, bed was comfortable, and there was even some essentials already waiting in the fridge. The kitchen area is small but even staying for a week, I only really cooked a few meals and all that I needed was available.
You'll see that finding the flat is very easy and don't be put off by the graffiti as you'll see most of Rome is covered in it. The area nearby was safe at night and covenantally located near a supermarket (great pricing) and the best Gelato you'll ever have (Giovanni Fassi).
I would recommend staying at this flat for short and long visits as Robert was a great host.