i can not recommend Roberta place enough. It has best view of Rome, 15 walk from Collosseum, 5 walk to restaurants or grocery store. You will have full shared kitchen to prepare breakfast and amazing shared patio on rooftop for evening gaze.
Location is close to Termini and still close to center. Metro is 10 min walk and there is huge Esquilino fresh market few blocks away..
Still this area is not in exact center so you will need taxi if you dont like to walk.
Communication is easy and Roberta will make sure you have the best stay.