Definitely the best thing about Sita's apartment is its location. Not only is it at a walking distance from (most) "must see" attractions in Rome, but it's also very easy to get to from the main airport (Fiumicino).
The not-so-good part about the apartment is its internet connection. It didn't work for us for the first two days we were there (some company problem which could only be fixed on Monday). When the company did "fix" the router internet still worked only sometimes and when it did it was extremely slow. We also had some small problems with the shower (which was making a weird sound) but those were sorted out fast.
I did appreciate that upon arrival Sita had some orange juice and cookies for breakfast for us (details like this one can make a big difference on the experience as a whole). The kitchen is not fully equipped though, we tried cooking some (very) basic stuff and had to improvise (for example, there was no spatula).
Overall we enjoyed our stay at Sita's place, but that's mainly thanks to the area where it is located.