If there is a 6 star, I would have given 6 star. Cristian is super nice. He welcome us, answered all our questions, provide all the advice, all with a big smile. He left us with fresh milk, juice, fruits, etc. which we didn't even expect. Whenever there's an question/issue, he's always there.
The house is in the center of everything. We can walk to most places. Outside the door is the busiest tourist location with people/drinks/noise; inside the door, there's garden, A/C and absolute quiet. The house is newly renovated, clean and has everything.
Without looking for other houses, I believe this is the best of the best in Rome.