I've stayed 4 nights in Sergio's lovely apartment. it has a lot of character to it - the decor, the high ceilings, the free standing bath, the little porch over looking a green square. much more then ordinary place.
the room had very comfortable bad, double glazed glass window for the noise coming from the street ,heavy shades for morning sun, a small fridge and an electric kettle to make your own tea or coffee. the room was made up every day and towels were changed after two days.
The location is well connected to the city center with the Metro just 2 min walk and buses and tram. rome is not too big so you can also walk practically anywhere.
an elevator is also nice addition and you also get a voucher for a coffee and a pastry in a cute cafe' near by as a breakfast.
so overall I had a great time here and in Rome generally.
the only thing one should consider is that the neighborhood is not the posh, not as nice as in the center - lots of Graffiti and immigrants around. nothing troubling - I was travelling alone and didn't feel any fear, but I suppose rome has nicer areas especially at night.