Silvia's place is a good location to explore Rome from for its price. Though a bit of a walk from both a A line or B line metro station, relative to other places it is worth the walk. It is also near one of my favourite gelato chains (la romana) and quite a few restaurants on the way back from the stations. A good location overall.
The apartment itself can house up to 5 groups of people, each with their own room and bathroom. The breakfast is simple but abundant, so for a traveller on a budget it's very worthwhile.