How is it for a solo traveler in Rome ?
Absolutely fine. I went alone last year with no problems. Please feel free to ask me any specific questions.
In what regard? Not everyone travels in pairs - many people travel solo - business people, travelers, no problems - you can do whatever you want to do just as you would if you were not alone.
Can you say what it is you are specifically asking about?
How is what?
if you mean it is safe: yes. If you mean do people treat you differently because you are alone: yes- usually they are much friendlier... I have been to Rome numerous times alone and love it-