So I stayed in Giacomo studio with my sister for like a week, first of all the place is in a very good neighbhood in Rome which is close to Vatican and also most of Rome's main attraction. There is bus stops very near the apartment as well as train station which gets you to the metro (7 min walking). Therefore, the location is Excellent!
The studio itself, has almost everything, a washing machine, kitchenet, cooking things...etc and also it's clean. Giacomo is very good in communication he was always there answering any question and also the check in and check out process is very smooth as well!
Generally speaking, the studio is very good and I recommend you going there! the only this is that the bed is not very huge to fit 2 people but you can manage (it's not that bad).
So try it ;)
Cheers