Dear Gustiawan :)
Thank you for your words but also for your advices, as you have said, my flat is at 2 minutes walking from Termini, the main station of Rome.
From there you can find all the transportation you need to go everywhere all around the city.
At least, the main attractions are all in the center so from termini, it shouldn't take too much time. it's really important for me to make my guests, in my flat and all around Rome as comfortable as possible!
Come back when you want, you are welcome here :)
All my best Wishes,